I think they should make it on OpenGL instead of DirectX.
It supports both. There are two plugins, one for OGL and one for DX9
And foremost: the Cube itself runs on OpenGL already!
ATI is known for it's DX and not for it's OGL. The cube's graphics were made by ATI hence the ATI on the front of the console so it would seem you have it mixed up.
And emulation does not support GPU acceleration? That's stupid!
Other emulators do, this emulator does not, yet. And I do not think it's stupid, I think the word stupid is stupid when used in a situation that you do not understand.
Is the project going to support Wii as well? They have roughly the same hardware.
It already does, if you looked at this thread at all you would have seen the Wii screen shots. Wii games do not have any controller support yet so the games do not go any further than the title screens, yet.