From an outdated 1978 interview with Wright:
Interviewer: So are we likely to see Hank Pym?
Wright: Well of course. Who else is there? It's not like another guy is going to come along in a year's time and steal Ant-Man's costume in some random Marvel Premiere issue. I promise you, this movie will be out before 1980. We've got some great special effects right now: Star Wars cutting edge level. You'll believe a man can shrink.