I'm hoping they'll do Wolverine's death from the original story, where there's nothing left but the adamantium skeleton. I also hope we see Prof. X sporting those robot leg braces he had in the future scenes on "Wolverine and the X-Men".
Anyway, while my hopes are unusually high that this movie is going to be badass, the thing I'm worried about the most is what tvtropes calls
San Dimas Time, or similar "Meanwhile in the past/future" plot gymnastics. I'm hoping that after the time travel occurs, that's the last we see of the future, because it'll be weird if they keep intercutting between time periods while the characters in the past are actively trying to change the future.
Other than that, I can't wait.