From Shadowboxing ...
Look lets just all admit we don't know whats gonna happen. We all get on here and go thats suggestive of this, thats suggestive of that. If you make a conculsion first its easy to twist information to justify it. You do not know, I do not know. AICN was not the script, we now know they have made major revisions to it ... So we at this point cannot trust the information from that "script" ...
ShadowBoxing, with all due respect, putting together clues is what I do for a living ... literally. I'm a historian; I try to reconstruct "what happened" from (often very) limited evidence. So I get a lot of practice at hooking together disparate clues, reading between lines, looking at what isn't said, weighting conflicting evidence ... etc. Wading through movie gossip really isn't that different.

Most of the same skills (and tricks) apply.
What I see:
1) In reaction to the leaked AICN script, writers and others say, "That script is months old. There have been a lot of revisions since!"
But, let me point out something. "Revision" is not the same thing as "substantial changes to the fundamental plot arc." A manuscript can undergo revisions -- even
major revisions -- without altering the basic plot. Or said revisions may alter SOME plot points ... but others remain as they were.
PLEASE, let's stop confusing "revision" with "throwing it out and starting from scratch," or "everything's going to be different!" That's what I see a lot of folks doing. On the contrary, it sounds as if large chunks of that script plot ARE being used, revised or not.
2) James Marsden has been back in the country since at least August, I believe, or perhaps the end of July. His wife had a baby girl in early August, and I think she was born here (whatever their hopes that she'd be born in Sydney).
Yet he hasn't apparently been spotted by ANYone, in ANY set report. Maybe he's spending all his time in his trailer, changing diapers, but I doubt it.
Also, no one at FOX is talking about Cyke specifically in interviews. His name is being listed in the credits, yes. That means nothing. No one is TALKING about his presence on sets, or his character. How curious, if he has any kind of role. And I know (personally) one individual who was on the set as an extra for a major scene in which -- if Cyke's character did live through the film -- one would EXPECT him to appear. Yet he wasn't there.
That is what we call an "argument from silence." Just not seeing someone doesn't mean much except one didn't see him. BUT, not seeing someone
when you should EXPECT to see him is much more criticial. Now, there may be a reason he wasn't in that scene even if he lives to the end ... but the fact he wasn't is very telling.
3) IMDb has updated X3 cast and crew data and his name has been moved DOWN. Now, I give very little weight to the IMDb, in most cases. They're notoriously unreliable to the point that actors find the thing funny. But again, it's a little odd that his name was up higher in the list with the other returning actors, but now it's down under the "listed in alphabetical order." Maybe someone "edited" the cast who has a hate-on for Jimmy. But maybe not.
4) Then we have these persistent rumors from various gossip rags who often like to undercut each other, yet they all agreed on the point about Cyke's death. The only rumors I'm hearing that have him living are from individual Joe Blow types who claim to have read the script. Maybe one or more of them have, but even the gossip rags have been strangely silent recently about Cyclops, with a few exceptions such as the recent "scoop" on the trailer description, something receiving very mixed reactions. We will at least know when the trailer comes out whether it's accurate.
But if it turns out to be bogus, and we see little or nothing of him in the actual trailer, then yeah ... I'd say the AICN report was true, and whatever revisions they did, it didn't include removing Cyclops' neck from under the axe.
ALL that said, this is one critical analysis about which I'd be ECSTATIC to be proven wrong. I'm just cynical, at this point. And the longer it goes with no sighting of Marsden, or (official) word about Cyclops, the less hope I have. And it pisses me off.