As you may or may not know CES went down recently and Hyperkin got a ton of press on their Ultra Gameboy which we covered. Something that went under the radar was this little guy, Mega RetroN HD confirmed by Hyperkin on Facebook with a unknown release date.
They also confirmed that the Mega RetroN HD will not be emulation but pure hardware baby! So that means the sound should be close to, if not spot on. I assume that also means better compatibility.