THE SKY IS... SAGGING! REALLY! IT COULD FALL ANYTIME! I'M SERIOUS!

The druid preview leaves a lot more questions than answers for cats.

Haste
Haste affecting energy regeneration is an interesting mechanic (but we knew it was coming a long time ago) - the main question is how MUCH, as it could very EASILY become our number one stackable stat.  Right now even only affecting white damage and OOC procs, it's very close to strength and agility in ICC gear, and only really loses badly to ArP - a stat that's going away in 4.0.  If nothing else changes, for the month or so between 4.0 and Cataclysm's launch, we could well be raiding ICC gemmed for full haste.  This will have to wait for a blue post or beta before we can start really theorycrafting it, and I'm sure this is a value that will be tweaked significantly, even after Cataclysm goes live.

Mangle
Buffing Mangle "significantly" is the only potential sky-is-falling change announced in this preview, and I'm not sure they will actually go through with it.  The reason is, as I pointed out in my first real post here even, Mangle damage is not all that bad.  For being "easier" than using Shred, all you give up even at the sharp end of raiding is something like 500 DPS out of the 10k you're doing.  In PVP the gap is even smaller because you can't be guaranteed to be able to use Shred.  They say they want to do this so that ferals will not be at a significant disadvantage if they can't shred, but that's the entire POINT of a directional requirement ON shred - the extra damage is a reward for dealing with the extra difficulty involved in using it.  If there was no reward, there would be no reason to press the button.

The only time when mangle is currently at a really significant disadvantage to shred is if you're trying to burst someone in a couple of globals, and then you're doing around 25% less damage per GCD, which could maybe let them live, and that's a distinct arena problem (and even then, arenas in Cataclysm will feature larger hit pools, and more armor mitigation on squishy classes - bursting someone in 3 globals will still probably happen, but it won't be such a major part of strategy).  A buff to Mangle damage will essentially make it an equal choice with Shred in PVE, and then people just won't bother with Shred anymore - and helloooooo faceroll rotation!  Not going to fly at ALL with most dedicated DPS ferals.  Mangle buff isn't the solution - I'm not sure what IS yet, but I'm pretty certain that this ISN'T.

Promises promises
The final change affecting cat DPS is whatever other method of making it "less punishing" if you screw up has yet to be announced.  It's a lot of hand-waving right now - they're making promises but won't reveal details just yet.  They might just reduce the amount of damage that SR accounts for and then buff base damage across the board - so you're still using roar, but it sucks less if you drop it.  Or they might have another ability refresh Roar (make it Bite!  Please!  And get rid of the "execute" mechanic!).  Or they might make Roar last longer, or they might make Rake last longer, or who knows.  The idea seems to be to keep the same number of buttons (yay), but make it easier to keep all the balls in the air (somewhere between "eh", "meh", and "boo" - I require details before I panic).

Swat
Getting a real interrupt is a mixed blessing.  Yes, it's GREAT for PVP, and it makes us more useful in small-group content when there's an interrupt requirement (if anyone remembers trying to do Romulo and Julienne without a rogue or warrior?  Or Vezax10?  Oof).  On the downside, it makes us useful when there's an interrupt requirement.  Now instead of happily pewpewing away for Vezax25 or Reliquary of Souls, we'd have to actually earn our keep - and run the risk of wiping the raid if we screw up.  While we're already trying to balance our rotation.  [Desk] hits [Forehead] for 10,000 damage (Critical)

Vrooooom
Stampeding Roar will be a fun toy, charging around with the melee group.  It's actually quite a good raid DPS increaser on a fight like Putricide.  And it will make people CRY in Warsong Gulch.  CRY I tell you.  I can't WAIT for the whiny neckbeard videos to pop up on Youtube.

Whoah man, do you see that?  Trippy, man
Depending on the numbers, we might actually end up using Wild Mushroom.  We might end up popping it on AOE groups after running out of energy swipespamming, or dump it on a boss right before combat starts, or just pop it whenever we have to run out since it's an instant cast.  Will have to see how much it hits for untalented to figure out if it's worth dropping the couple of autoattacks that would be lost.

No, I'm not cribbing off Yawning in this section
So there we go.  One big unknown, a few small ones, and some neat tidbits.  It's not catastrophic (yet), it's not super-exciting (yet), and there are a LOT of unanswered questions.  Some stuff I'm looking forward to finding out over the coming months:
How will weapon scaling work?  Will Rip/Rake/Bite scale with weapon damage, or will they just have higher AP coefficients?  Will our attack speed change with different weapons?  Will Predatory Strikes still increase weapon damage by ~15%?
Will 4T10 (rake crits) just go away, or will that become baseline or a talent?  A lot of classes are getting DOT ticks affected by crit and haste baseline, although I'm fairly sure we won't be getting any further haste benefits...  If we don't keep it, a LOT of ferals will probably be wearing 4T10 deep into tier 11 raids - it'll be tier 4 in Sunwell and tier 6 in Naxxramas all over again.  If we DO keep it, how will they fix us the next time we fail to scale?
What are they doing for our ramp-up time?  Rogues are not only getting to use CPs on dead targets to maintain S&D (I have to assume that we'll get access to this mechanic as well), but they're getting a cooldown that basically lets them take their CPs with them on a switch.  We not only have CPs, we have TWO debuffs that need to be present, and a quarter to a third of our damage comes from a 5-CP finisher that takes 22 seconds to tick off.  This doesn't add up to happy fun times on multiple minion-style targets.

So.  We'll see.  But stop @#$%ing flooding the forum with QQ, it's way too early to get upset over ANYTHING here.
And if we keep the bonus, how will they fix us the NEXT time we fail to scale?