I find Iron Man v. Hulk a really boring prospect from a spectacle level; we'll see if whatever leads up to that is interesting emotionally.
Trying not to get my hopes up about the shot of ballerinas; it could be Scarlet Witch instead of Black Widow.
(But her entry of dropping out of the plane on a motorcycle is pretty badass.)
I know there's a Cap 3, so Steve lying beside his broken shield isn't very scary.
Ultron's jerky movements in his entrance are creepy, though his voiceover is bog-standard.
There's a video in the comments that's the original of the song being used.
And I'm still going to need to be convinced that Tony was sufficiently fucked-up post-IM3 to be so un-genre-savvy as to be responsible for Ultron in any significant way.
. . . huh, that was a lot more lukewarm than I expected it to be. Well, there's time, and it's not like I won't be there opening weekend anyway.