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Spoilers Below
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The Current Plan for Volume 3:

1) Ali Larter will return to the show (as Kristin at E!Online has already reported) but are planning to wrap up her storyline up in Volume 3. (editor's note: Also, there are rumors floating around that Ali Larter's evil alter ego Jessica will be a part of the Volume and not Niki.)

2) Micah's storyline will end also

3) David Anders (Adam) will return and will meet a new friend

4) Adrian Pasdar (Nathan) well thats it up to the fans and he "might be back so don't worry."

5) Zachary Quinto (Sylar) will be more bad ass then ever and when we come back he will kill a star on the show

6) Villains is the start of something bigger for Heroes and hopefully it will be more fast pace then Generations (Volume 2).

or of darker storylines for the Superhero genre so it is good to hear that Adam and Sylar will be back terrorizing the Heroes.

Source THE ODI