In an interview with Huffington Post, Wright talked about his version of Ant-Man and how it is being adapted from what is known about the hero in the Marvel comic universe.
"It was never in my script. Because even just to sort of set up what Ant-Man does is enough for one movie. It's why I think 'Iron Man' is extremely successful because it keeps it really simple. You have one sort of—the villain comes from the hero's technology. It's simple. So I think why that film really works and why, sometimes, superhero films fail—or they have mixed results—because they have to set up a hero and a villain at the same time. And that's really tough. And sometimes it's unbalanced."
"I think there's something in that it's a lesser known character, there's hopefully more license. For the one percent of people who are like, 'Wait, Hank Pym would never do that!' there's 99 percent going, 'Who's Hank Pym?' So, to me, the source material is great but it also frees you up to be like: I'm going to make a movie. The movie is not going to represent 50 years of Marvel comics because that's impossible. But I'm going to make a 100 minute movie—or 110 minutes [laughs]."
Of course the director is talking in very vague answers because that's how Marvel Studios operates with all their movies but it is important to look at one thing Wright mentioned. That's the part about how a "villain comes from the hero's technology." Let's speculate on this!
In theory, both Pym and fellow Ant-Man Scott Lang could be in the Phase 3 film and it is important to note that Lang's introduction into the Marvel comic world was as a burglar who breaks into Pym's lab and steals the Ant-Man suit in order to commit crimes. But there's a somewhat silver lining to Lang's intentions since he turned to burglary in order to help his ailing daughter.
Whether this is a similar story line that Wright will use, or perhaps just an adapted basis for his film, remains to be seen. But it's sounding a bit like Lang could be Ant-Man's villain since he would be a "villain [who] comes from the hero's technology," if a similar story line has him stealing Pym's tech.