I could be wrong, but I'm sure I heard somewhere that Ant Man will tie in with the rest of the universe in some way. Like I said though I might be wrong. I'm also looking forward to that I think it's very underrated due to it following AoU, but I think it'll be better. AoU was definitely not one of my top Marvel movies.
Age of Ultron could have definitely been tighter. I only saw it once, but I remember leaving the theater feeling that with a few changes here and there, the whole story could have been more compelling. In all honesty, it's my least favorite Marvel movie so far. I have decent hopes for Ant Man, only because I enjoy stand alone stories more. Though I'm sad to hear that Edgar Wright left the project because Marvel was being too controlling, which incidentally ties in to why I tend to support creator controlled comics over Marvel's and DC's offerings.AoU was definitely not one of my top Marvel movies.
Yeah I was upset about that as well. My friend said they had to come up with an entire new script for Ant Man after Wright left, so even if this is a great movie, he's gonna leave knowing he's' missing out on a potentially better story. But who knows really. We get what we get.