Kristin from E! Online has the following to report regarding the character/actors that appeared to have died during the finale of "Generations."
Ali Larter: According to Heroes insiders, Niki is not expected to return to the show. But her devilish alter ego Jessica? We'll see her as soon as the show comes back to the airwaves (when the strike is through). At least, that's the current plan, according to sources, who sayproducers had "done all they could do" with Niki.
David Anders: You can bet Hiro's sworn nemesis will return. Insiders say the current plan is for Adam Monroe to be back to torment our favorite squinty teleporter, i.e. the "carp."
Adrian Pasdar: The production and writing staff is somewhat split as to whether Nathan should return to the show when the show returns. Really, though?!? Heroes without the brothers would be like Prison Break or Brothers & Sisters without the brothers: i.e., a waste of time! Surely Claire's blood can save her own father, right?!