Yes, San Diego Comic-Con (SDCC) ended last last month, but information still seems to be trickling out. Though not explicitly said that we won't see Janet Van Dyne (aka. The Wasp) at all in Marvel's Ant-Man movie, it was suggested that she might be missing from Hank Pym's (Michael Douglas) life. President of Marvel Studios Kevin Feige also seemed to confirm that a famous bit from Pym's history, namely the famous slap, would not play into cinematic Pym's history. So it seems that other than inspiration, Janet won't be a big feature in the movie. However, Janet Van Dyne's presence is not completely gone, as it was revealed during SDCC that Evangeline Lily was cast as the daughter of Hank and Jan, Hope Van Dyne.
So, perhaps "daughters" may be another theme for the movie. In a brief interview with Ant-Man director Peyton Reed, he cites that "heist" and "passing the torch" will be themes in the movie, but he also reveals that Scott Lang's (Paul Rudd) daughter may be part of the movie: "In the comics Scott Lang has a daughter, and that's part of the movie too".
Will we see an appearance of Scott Lang's daughter Cassandra "Cassie" Lang in the Ant-Man movie? No casting for this has been announced yet. In the comics, Cassie played a big role in the origin of Scott Lang's Ant-Man, but that also may not play out in the movie as the Darren Cross (Corey Stoll) character is more Pym's business partner gone astray who assumes the role of Yellowjacket; which is different from the comics. Regarding the comics, one might also wonder if Cassie could possibly take the path she did in those tales, and become the size-changing hero Stature (hey Feige, that might give you another option!). If the theme of "passing the torch" carries on throughout the Ant-Man films it seems remote possibility, though Stature fans might welcome a deviation from the comic storyline in that case.
Hopefully these questions will be addressed come July 17, 2015 when Ant-Man crawls into theaters.