Not that I know of. I reckon the jury is still out of who will win the HD platter-player war and as such perhaps the potential manufacturers are holding back till then.
For hard-disk based players, there are, amongst others I'm sure -
Electrosonic's HD Frend (http://www.electrosonic.com/hd_frend.shtm) and its Plus version.
AvStumpfl's SC Media Engine, a 1U 19" PC specially put together with a few extra features for control purposes, with embedded Windows XP. But there is hardly any info on this at their site. The distributors/dealers would have the details though.