One problem with guessing credits order Is It's unknown who time traveler Is and how much screen time the future scenes will get.
Yeah. If Wolverine doesn't get to be a time traveller, I could see the film do "and Hugh Jackman" like they did with Charlize Theron in
Prometheus.
It's probably not going to happen, but it would be funny after all these discussions if the DoFP poster actually just had a giant Sentinel image on it and no actors

t: I mean, look at the
Star Trek: Into Darkness poster that's out now: it just has a post-apocalyptic shot and one tiny figure who I presume is Kirk but could really be anybody. No actor heads or anything.
And actually, if they do intend this to be the Biggest X-Men Movie Evar, they might in fact want to sell the elements other than the actors in the movie. The "old cast + new cast" thing will create interest for sure, but I suspect it will mostly preach to the converted. And the biggest X-Men movie to date - with all the most popular characters,
the most popular character and the biggest star, the two movies' worth of build-up - still didn't make anywhere near enough to put it into the Avatar/LoTR/Avengers territory. Like I said in the other thread, they'll need to pull in the people who never had much interest in X-Men.
And yes posters are all about marketability, and sometimes it's not even about how well-known the actors are. Case in point:
Lady Deathstrike is played by an obscure actress, has like one line in the whole movie and one scene of any note. So why is she on the poster with McKellen and Stewart stacked beneath her? My guess is, because she looks exotic and hot and this is a movie geared mostly towards young males. Sometimes it's just about being young and attractive.
Whatever the DoFP poster turns out to be, I hope it's a huge improvement on FC poster. That poster was just blandness personified.