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I'd expect that it would be
I'd expect that it would be a straight port, including multiplayer but excluding online support. While somewhat interesting, I don't see this being something I'd download. I have my Ex-box for playing my old games. I'd also expect that these games would have the same backwards compatibility problems that you have when playing from the disk (framerate, lock-ups, etc).
If they did modify Halo:CE to support online multiplayer, I would be smitten for life.
Take this next statement with a few shakers of salt:
This new feature does give some credence to the rumors that Shadowrun will eventually be made available as a free download on Marketplace.
In a land of chipmunks, an angry gnome is king.