Is Dr Erica Sondheim in this movie? She was one of the main characters and plot points in "To Steal an Ant-Man", since she was held captive at Cross Technological Enterprises and was the only person capable of saving Cassie Lang, and was the motivating factor for using the Ant-Man costume. Hank Pym also saw what Lang had used it for and allowed him to keep the uniform (similar to what Douglas says to Rudd in the trailer that he's watched him closely etc).
It would be a shame if Sondheim is omitted from the plot since she's so central. But no-one seems to have been cast as her.