Technically speaking there should be no prob for PS3 and other HD/blu players to handle these 8GB backups, since .mkv files use well known and supported h.264 codec. However, all standalones need time to evolve (market demand) from playing blu structures to supporting individual files; similar to DVD payers that later supported DIVX (even tho it was a difficult trick to pull - DIVX is not MPEG2). For now to play these MKVs on PC there is no need (I suppose) for any HDMI/HDCP compliance, just enough horse power.
I tried playing one of these "trailers’’ and while quality is exceptional , it stutters and freezes. I guess it wants a modern video card with .264 coded hardware support, but I may be wrong.