According to Deadline Hollywood, we have some new casting information:
Nonso Anozie will be playing Sergeant Dap in the upcoming Ender's Game film. I'm assuming this is the same "Dap" who is in charge of the launchie group Ender is a part of, aka "mom." :)
Another Wiggin has also been cast: Stevie Ray Dallimore will be playing the part of Ender’s father, John Wiggin.