Yeah it's kinda weird thinking of a current-gen console hosting games designed for a next-gen console. Myself and others may think well that's a silly way of just saying the next-generation's console is going to be Backwards-compatible.
The folks over at Xboxevolved have a rumor that the Xbox 360 will have forward-compatible games developed for it as early as next year. Claiming that additional features, visuals, controls, etc... will be available upon using the forward-compatible games in the next-generation Xbox.
This article has some more details:
RUMOR: Next Xbox to be “Forward-Compatible”