I hadn't seen anyone mention this here yet and figured I'd point it out. Although all the details aren't announced yet, Retro-Bit has shown off their latest console creation at E3. It's called Retro-Bit Generations; a small plug & play style console that has both composite and HDMI out, 2 Genesis-style six button controllers, and has a bunch of emulated arcade games installed. From what I've read they've licensed both Capcom and Data East titles (maybe more?) and it's going to include around 60 games. Does not have a cart slot and no word on any SD card slot or any other hardware details. You can see pictures of the system along with the so far announced game list on Retro-Bit's Facebook page or website.
No price point announced yet and obviously this isn't going to contain anything you couldn't pirate for free right now, but it's got my attention (especially if the controllers are good). Even if it's just a bunch of CPS1/2 games with some Data East oddities thrown in I could see myself picking it up. Being the soured old man I am this thing has my interest peaked more than anything else announced at E3.