don't think Meridian will go all out for the HDMI as yet which make sense. HDMI is not a perfect interface. OK both sound and audio with one single wire is a very good idea but HDMI make for a nightmare of a connection. The biggest issue with HDMI is the HDCP handshake which is a hit and miss type of connection with most of the displays out there. Second issue is how easily this type of connection could come loose in most applications in the real world. As you know Meridian and Faroudja's D-ILA PJ did not go with HDMI connection. DVI is the perfect interface in my book.
All video is still 8 bit color (8 bits each for red, green, and blue, for a total of 24 bits). HDMI will handle 10 and 12 bit video signals, but we don't have any such signals from sources for it to handle at this point. Maybe a few years down the road.