Yes, big, big spoilers, because they killed someone important.
I wonder how long he'll stay dead. All the same, this is one of the characters who'd been central to the Marvel Universe, even if he'd been playing an increasingly peripheral role in recent years.
Go to Scans Daily for more.
But, yes, the bastards have killed off Professor X.
And he gets killed by an out-of-control, Phoenix-powered-up Cyclops, the guy who was like a son to him. This is in Avengers vs X-Men #11, by the end of which Cyke has gone totally Dark Phoenix on a whole bunch of Marvel's other major characters. This event had been getting boring for me, but I'm now interested to see how it ends in #12, and what happens afterwards as Marvel now rejigs (without actually rebooting) its universe. They are not only reshuffling writers in a big way. There will also be some dramatic reshuffling of character roles to look forward to (hoping they work).