Check this out:
CraftyMech BitKit2 FPGA
http://craftymech.com/bitkit-arcade-fpga/
I was looking up alternatives to Mister (blasphemy!!) to possibly ALSO include with a switcher in an arcade cab to allow for multiple EMULATED arcade games in addition to NON-emulated Mister ones (I am a stickler on the non-emulation aspects of FPGA).
Interesting that there was ANY other kid on the block than Mister when it came to FPGA arcade solutions. Obviously, a simple glance and you know the Mister is way more capable and can do console, computer cores and more. Still, when I think of this and the Mistex project, I am happy to know there are at least OPTIONS beyond Pandora Box/pi.
I haven't scrutinized their supported game list and if there are arcade titles not currently supported by Mister? Maybe they ported the Mister cores to that platform for all I know.