Warning, Spoilers ahead if you haven't seen the movie.
Personally, I hate how Halle Berry offed two perfectly fine characters just so she could be in charge of the team, so she'll be joining the Kellogg's mates and the new Speed mates under my trusty hammer.
Awe, you shouldn't be two mad at her.
The Reason Cyke died (well, we realy don't know if he died since we didn't actually see him die, which I'm sure was done on purpose ) is because James Marsden wasn't availible 'cause he was off filming Superman Returns.
And The Professore didn't die for sure, which you would can see for yourself if you watch the scene after the ending credits on the DVD. He transfered himself, into the coma patient on Muir Island...I think it was just meant to be dramatic
I swear, I don't think this movie had any closure. The one thing that is pretty certain is Jean's death, but even that could be turned around to her saving herself and hibernating.