Little did we know, Antman was there all along!
Since the revelation of Edgar Wright and Marvel Studious parting ways, I've been thinking quite a lot about Ant-Man and how they might be approaching him within the MCU.
Although I kind of like the idea of Hank Pym's work shaping and influencing the MCU between WW2 and present day, i would much rather have him lining up alongside the Avengers in present day.
Ideally I'd still have Hank Pym create Ultron, maybe not the robot itself but the underlying AI. Initially this wouldn't be made known to the viewer. But after the first encounter with Ultron, Tony would figure out where the AI originated. This would provide a logical way of introducing Hank Pym into the film.
I also think Marvel have removed one of the more logical methods for recasting further down the line. If they had gone for Hank Pym fighting alongside the Avengers in present day, the could easily replace him with Scott Lang's character when the actor got to old or fulfilled their contract.
Anyway, I thought I would mock up something that I'd love to see appear when Ant-Man does eventually come out. Alas, it will never happen.