According to the Xbox Live site this is what we can expect from the game.
* Classic arcade action: R-Type Dimensions includes R-Type and R-Type II, two fully playable classic coin-op games.
* Multiple game modes: Try the Classic game mode with play that exactly mimics the original coin-op experiences, or the all-new Infinite game mode, assuring the completion of your game regardless of skill level. Either mode offers both single player and all-new co-op play (both local and over Xbox LIVE). Switch on-the-fly between 2-D and 3-D graphic modes even during play.
* Crazy camera: Play from a non-orthogonal camera view, adding a whole new perspective.
* Cooperative play: New cooperative play uses a simple yet thrilling revive system, and a ship collision feature that can be turned on for added difficulty and sparring.
* New features: The new stage unlock functionality allows you to have immediate access to your favorite stages, and the new Continue option lets you restart from the last accessed checkpoint when the game's over.
The Infinite game mode looks interesting as it will allow anyone to finish the game regardless of their skill. I don't think I have to go out on a limb too far to say there probably won't be too many achievements you can earn while in this mode.
I'm not sure if I'm the only one, but I would much rather see new content being released than a re-hash of an old game. We'll see what Xbox offers us next week!