This second trailer leave me with a better feeling than the first. Not that I hated the first one, but there was something about it that didn't give me that "Oh, Cool" feeling. I'm still only 80% convinced that Bryan Singer is bringing the magic. His first two X-Men films were great, but Singer can make some boo boos too (Superman Returns, ahem).
To tell the truth, I'm more concerned about Fox having stuck their non-geek hands into the production. By far, this trailer is something to enjoy more than be doubtful about. I see that they definitely took some things directly from the comic - Uncanny X-Men 141-142. I'm talking about the 1 second clip with Storm at the beginning. Check the pic below.
X-MEN: DAYS OF FUTURE PAST comes out May 22nd of this year. I'll be there. And I'll be pissed if they don't include an After-Credit scene that gives a clue about Apocalypse.