Valerian, no other class sees 13 abilties from an entire school being effectively useless all the time, 6 is far too large a number the most any have is 1 or 2 that they NEVER really use, and many classes have no abilities regardless of spec that they never use, only druids, in particular balance druids, and we're talking uses in ALL aspects of the game now, PvE, PvP, pvE solo, pvE raids/groups, PvP BGs..I hope they'd eventually make it more versatile.
Anyway back to more WotLK, here is an FAQ from Starla I lifted off wikidot on Feral abilities:
Lock Jaw
Q: How does Lock Jaw work?
A: Lock Jaw is a finishing move that causes periodic damage and stuns the target for 1+x seconds (where x is the number of combo points available). It is essentially Kidney Shot.
Lock Jaw follows the fine Druid tradition of causing a bleed effect. This bleed is affected by Mangle and Primal Aggression and is likely affected by other things I have forgotten to mention. Maim of course is not broken by the effect. The periodic damage effect currently lasts as long as the stun is active, however this is likely a bug and the duration will likely settle on either 12, 18, or 21 second durations as is consistent with other periodic damage effects in World of Warcraft.
Feral Charge
Q: How does Feral Charge work when used in Cat Form?
A: It works much like Shadowstep. Currently it doesn't have an animation and bugs out on most private servers as a result, however in the alpha, your character teleports behind the target in a similar fashion to the aforementioned Shadowstep ability. Rather than adding a combo point, it dazes the target for 3 seconds so that you won't lose them after you use the cooldown. This is an important difference between the Rogue and Druid versions of this ability, as the Druid one actually makes it much easier to keep on the target.
Using Feral Charge in any form activates a shared 15 second cooldown on both abilities.
Beserk
Q: How does Berzerk work?
A: Berzerk works just like the description says and there are really no hidden caveats here. It is worth noting that if you have the King of the Jungle talent, using Berzerk (Cat) in conjunction with Tiger's Fury will give you three Mangle attacks right out of the box. Correct usage in time with your energy ticks could result in three Shreds, however I am not math-inclined and do not know if this would result in an increase in DPS.
Using Berzerk in any form activates a shared 2 minute cooldown on both abilities. You will never be immune to CC for 40 seconds. Nice try, though.
Other
Q: Are there any changes to other trees that affect feral druids?
A: There are a few additions, including Master Shapeshifter which is an additional 4% free critical strike for Druids in Cat Form. That brings your total up to 15% crit (I think) from talents alone, which is a very nice total.
Omen of Clarity is now passive, which is nice. In addition, Furor will no longer activate a server-side check, meaning you have nearly instant access to Feral Charge when shapeshifting (obviously, this still activates a server-side check).
Q: Any other things that might affect PvP?
A: Druids do not regenerate mana in forms as of 8391. This could be a bug, but there is no official note about it either way. There were a few technical changes to the way mana is regenerated in 8391 according to a source of mine, so it is possible that there is a missed connection to the way Druid mana recovery works in forms.
This could be a good place to note that Feral Druids are currently monsters at 75 in what little PvP there is to be had. With 2800 AP in bear (the Druid in use has good gear), I am able to crit for about 2600-2700 at key points with Maul, and about 2200 with Mangle (Bear) on low-armored targets. In addition, the Sweeping Strikes effect on Berzerk is absolutely incredible in group PvP situations for a variety of obvious reasons.
The efficiency nerf to Druid spells is hurting Feral Druids a lot as Intellect is still a secondary consideration on Feral Druid gear. I would like to see a buff to Heart of the Wild, but time will tell.
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Feral has great burst potential, but sustainable damage? scaling? well don't even go down the scaling route till we know more about the gear. Tiger's Fury looks good for sustainability, and now that Rake gets a damage boost it's looking to be back in the cycle. There is no real sustainable dps jump, well some more crit here and there etc, leads me to think that rogues will be similar, they'd probably give combat a bit more burst and Assassination enough to at least not be considered the "inferior" spec. We'll see.