Just saw this @ CDfreaks.com

The player no longer only supports DivX, but also VidX, MP3 and VCD:

Here's what's new in this release

New GUI (from contest winner!)
A/V sync no longer drifts.
Divx3.11 support
Divx4.xx support
XviD support (this is new and is probably going to have some problems)
VCD (mpeg1) support
MP3 support

More info: XBox DivX Player 5 Download