Just for fun, no flaming please (hah, sounds hollow coming from me of all people). Blizzard has said they're already thinking/talking amongst themselves about a second expansion, and will have it out long before the 3 year wait for BC (I'd expect an announcement late this year or early next year, and have it launched next summer or around Christmas).
With Expansion number two, I'm sure comes level cap of 80 (they've said that the cap will be raised at some point, specifically that Medivh is a possible future raid boss that would be impossible at the "current level cap"). So, lets think about it. The Assassination tree as it is plays extremely well towards Mutilate. It's reasonable to want something to futher enhance that ability, and reasonable to expect it.
What is the biggest desire for Mutilate? Raid viability. This seems like the biggest desire among Rogues, just to be able to compete in DPS and not have to spec Combat. How would that best be accomplished?
Here's my idea. Vigor increases your maximum energy by 10. How about a similar talent, but instead of increasing energy, increasing maximum CPs? A six CP cap would work very well with Mutilate, allowing it to take advantage of its biggest strength to a greater degree. Longer SnD duration, better Ruptures, harder hitting Eviscerates. In a PvP situation, this wouldn't have such a profound effect (a six point KS would be the only real ramification), but in a raid, it would buff sustained DPS considerably, allowing real competition against Combat.
It would also be easily balanced. The extra CP is only as strong as the bonus it gives its skills. If an extra second on KS is too good, you could make it give half a second instead. Too much extra damage from Rupture? Just shorten the duration to allow higher DPS from reapplications, without giving too much damage per CP.
It would be an interesting talent to see, and could completely change the way the class played based on spec.
What are your thoughts? Any ideas for a talent you'd like to see? Speccable poison, improved Envenom, let's hear all the ideas. Just remember things need to be balanced, no "I am now God" talents please.