Sorry I did not see this yesterday. My daughter is doing game dev at USC, but she looked at WPI and RIT. If your son did not decide to do ED, take a look at Clark. They are opening an incredible new building for the game program: Media Arts, Computing, and Design | ClarkNEXT | Clark University and we were really impressed with everything about the program, school, and application process with them.
We also really liked WPI and their unique curriculum. RIT felt a bit remote and maybe not as social as the other two. However, RIT had the best food of any school we visited (and we visited a ton!) We had three DELICIOUS meals there!!!