There's at least 1 being worked on, but the general feeling is that whilst we might get full speed without sound, we prolly won't get it with. And even then, we're limited to 4megabyte roms (that's 32Megabit to those who're scanning rom-sites - a MBit is 1/8 of an Mbyte). That is about half the games for the GBA to be fair, but not everything.