This is a great idea! Have you heard of it happening like this anywhere? I would also be curious as to how a college would like to differentiate their message to the different grades; it would be an absolutely wonderful marketing opportunity for them. Win win?
I think this is a great idea! There are so many hoops that recently accepted/committed students are expected to jump through, and each institution has a different process. Having a centralized portal (like the common app) would solve a lot of problems and tackle summer melt head on.