After the end credits finish, there's a very brief scene in Moira McTaggert's lab on Muir Island (those who read the comics or saw the cartoon will know her). She's the woman from the scene earlier on, when Xavier was discussing Ethics to his class, & posed the question of e.g. would it be ethical to transfer the conciousness of a dying man into the brain of a man who was a veg - the man Moira was looking after in the brief video he showed the class. So, cue the post-credits scene...we see the veg man wake up, and - speaking with Xavier's voice - say something like "Hello, Moira". Shock, horror, Xavier isn't really dead..

I guessed they'd do something like as soon as Jean disintegrated him, seeing as how they'd forshadowed it with the Moira clip earlier on, & seeing as how, in the Marvel Universe, no one ever stays dead apart from Uncle Ben.

Scott & Jean are dead, Jean can surely come back again courtesy of the Phoenix Force, while we never actually saw Scott die, although if he is dead, it matters not as he's always been a crap character, in all X-Men versions. And I'm sure Magneto will be back, as the end scene before the credits shows that perhaps the "Cure" isn't so permanent after all.

The man lying in the bed didn't wake up and talk to Moira as there were all the tubes and medical things. I presumed that as it was off screen Prof Xavier was communicating telepathically, which is why she looked so shocked.