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They do have one confirmed new ability; a sort of cloaking device that lets them become invisible as long as they remain motionless. This was only "seen" during the Blizzcon demo when they were first found; a level would appear to be open and clear, and as a character ran through it the Vipers would appear once they began to move, when the character was in very close proximity.
Vipers are tangible while invisible; at times they would remain hidden until a player ran into them. Literally; characters would hit invisible obstacles and find their progress blocked while moving through one of the desert tombs, and after a second the cause of the delay would become evident when several Vipers appeared, in very close proximity to the character. In the Blizzcon Diablo 3 Panel part 3 video around the 3:47 mark, tomb vipers have the ability to appear as humans.