It's going to be able to play GCN, GBA, GB, GBC, and Nexus games. So my guess this is going to be alot like the PS2. Where you have both Gamecube and Nexus Memory Cards, the controller configuration is going to be mostly the same. However these controllers will be wireless. So in the case of GCN/GBA linking compatiblity you would have to use the Wireless adapter for the GBA (that is my guess). It has three High-Speed Serial Ports which opens the room for online gaming. I think their biggest flaw is that they did not include the ability to allow DVD or CDs to be played on the system. What I do like is the capacity of the Nexus games and the system stats, it sounds like they might be able to build very extensive games (bring on the rpgs!)