The thing I like C for is the simplicity. Writing C after working in a very verbose language for a while is refreshing. That said, my few wishes for a C replacement would be generics, methods, and namespacing. The last two are to avoid funky naming schemes everywhere. Maintaining the proper low level control and simplicity would be a top priority though.

Overall this project looks interesting. I'm interested to see where it goes in the future and what design trade offs end up being implemented.