Just want to give a little window into the Wrath Beta testing from a feral POV. My druid has basically always been feral (couple restro repecs, but those never lasted). I'm pretty deep into T4 content, mostly as a tank.
There are quite a few HUGE changes to the feral play style (and I've only gotten to lvl 71 on the beta realm). I'm sure I'm forgetting quite a few (or haven't found 'em yet), but I'll add to this list as I think of/come across big play style changes. Here's a few:
1. Energy and Mana no longer "tick". As soon as it is able, it just starts to go up. Add the fact that OOC is a passive ability, and in Cat form, I almost never run out of energy. And if I do, just pop Tiger's Fury (talented) to get 60 free energy (and attack power buff).
2. Ferocious Bite damage has gone way up. On trash mobs I'm used to seeing 2600-2900 crits on a 4-5 point FB (live). This has gone up in Wrath to over 3700 damage, and this is before I changed out any gear.
3. Haste is haste. Specifically there is no more spell haste or melee haste, just haste. One of the early quest rewards gave equip: +haste and use: +spellpower. I took it to replace my last green attack power trinket. Sure I'll almost never use the +spellpower, but the haste works for me as a feral. Looks like a trend towards combined itemization. Also, this is the only quest reward which was an upgrade so far...but I imagine I'll be in lvl 80 greens/blues soon enough.
4. Maim no longer breaks on any damage. So it doesn't stop your auto attack. Its kinda like roots now, where damage *may* break the effect.
If I get Recount working in the beta, I'll try to give an idea on how our dps goes. On live (and in cat form/gear) I do 500-580 dps on trash mobs (self buffed) and top out around 720-750 dps on raid bosses. I hope to see these numbers go up before I change out any gear.