I'm not clear on which device is getting what, but I can say this.
On XBOX 360, PC, and I believe OS X, they have a new Alien Breed trilogy that is displayed from an angled bird's eye view contrary to the original's top down view. Also instead of a sprite based world everything is done in the Unreal 4 engine.
On the iPod you can play the classics, as well as a new episode made just for the iPod. You can play in classic mode, or you can play in another mode which doubles the resolution and appears to use a different texture base than the Amiga originals.
What is really cool about this is the fact that it plays with a virtual dual analog set up. Generally, unless it is something like an RPG or Point and Click Adventure, I despise gaming on touch only devices. They seriously need buttons and a cross pad like Nintendo, without them, nearly ALL action games blow ass...
...with this exception, I find that even on my tiny iPod that my fingers are not getting in the way of the action, and that it is pretty easy to control, what is cooler is the fact that you can now run in one direction and fire in another which is something this game needed from the get go!
I could only wish that Team 17 would release their old sources, or come back and give the Amiga community a big surprise and at the very least go back and at least ad keyboard and mouse support to the classic version, so we could play it with the free fire option. Sadly this will never happen, and sadly I have to admit something this one time...
...that this Amiga classic is now officially best played on an iPod and not an Amiga. :/