I don't Nintendo cares too much considering ID software really isn't that cool. Plus any "engine" they make will probably be trumped by what Factor 5 is currently working on. (even if they are in financial trouble)
Factor 5 is basically dead. IGN has called their offices and emailed them and gotten no response since they fell of the map. Emails were bounced back as well. Don't count on them for anything.
I'm interested in what he has in mind. I just hope he tries to maximize the systems capabilities.
If he's been playing Wii a lot it means he's enjoying it. If he's enjoying it then he is probably going to make something he thinks he would enjoy playing. While true that this could lead to a Boom Blox like party game, it could also be something else, something more. It could also be something less as I saw all of the things mentioned in the interview that Ian mentioned. As it seems to be in a lot of instances lately: Time only knows. I hope time will tell, soon.