FPGA Arcade is already in our doorstep (some people already have it from the 1st batch) with AGA support, PS2/USB Mouse/Keyboard, SD card, DVI out, Composite out, not to mention mini-itx design with really small footprint (140x100mm).
http://www.fpgaarcade.com/common/replay_production.jpg
With the future daughterboard by Yaqube we'd also have a real 68060, RTC, 128MB RAM, USB with drivers compatible with Poseidon, Ethernet NIC etc.
http://www.minimig.net/yaqube/images/RPX060PCB4.JPG
Check also the video demostrating the daughterboard:
[ Show youtube player ]