I emailed this chap about 2 years ago because the Revo team wanted to send him an original unit, but he never got back to me. Well anyway, he’s got himself a crystal black Plus version now and talks a little bit about it in his latest video.
Skip to 26:23 if you’re not interested in the rest of his GBA related blabbering.
All 3 colour variations of the new unit are available now. There’s a crystal black featured in the video, a clear version with transparent blue buttons and a transparent blue version with clear buttons too. They’re available from the K1GBASP store (link), from eBay (link) and also from Amazon if you’re in the USA (link). It looks like they all ship from China, so be prepared to wait a little while for it.