I think the way the villain was lended itself to a good ending for him, and I don't think this is the last we'll see of them. That moment with the cat was pretty cool at the end, and a good plot point for both characters.
I'm glad I watched Winter Soldier the weekend before, because it was a surprisingly important movie to the plot of movies released after it. Haven't watched Ant Man yet, but knew enough to work with his character. Winter Soldier is just great, though, so I'd recommend it anyway.