It's not officially OFF the cards, but there are several other movies that he plans on making before he even starts on Ant Man, and with Ant Man he wants to make Scott Lang the hero.
So basically it looks like Pym and Wasp are being cut out of the Avengers movie for a movie that may or may not happen which won't focus on them.
And, in turn, that kinda messes up any plans to use Ultron in Avengers in future.
I enjoyed Wright's previous movies a lot, but I think his decisions are throwing a huge spanner in the works for the Avengers movieverse, and I don't like it.