RCA has announced that they've started shipping their new HD DVD player, the HDV5000. Here's part of their press release:
Officially endorsed by the DVD Forum industry organization as the next high-capacity DVD disc, the HD DVD format featured in the HDV5000 delivers sharper, more detailed picture performance than standard DVD discs. Moreover, the HD DVD format opens new avenues of interactivity including enhanced on-screen menus, scene searching, directors' commentaries and the potential for online shopping. For consumers with large libraries of digital disc content, the RCA HDV5000 player provides backward compatibility with current DVD discs as well as audio CDs that have been available for over 20 years.

The HDV5000 supports various video formats including MPEG2, MPEG4/AVC and VC1. The unit plays back DVD/DVD-R/-RW/DVD-RAM discs and mp3 audio files from CD-R/CD-RW discs.
RCA's HD DVD player can also upconvert standard DVD's to 720p or 1080i. The HDV5000 is shipping now for a suggested retail price $499. More information can be found here.