None that I know of (that play MP3s) and I bet it will be awhile because companies still want to sell accessories for their headunits like CD/MP3-Changers and hard-drive based MP3 Players like Kenwood's Music Keg. They make a lot of money off of those type of items and if you can burn over 1200-1500 songs on a single DVD doubt there will be much of a market for a $300 changer or a $500 'Music Keg'.
That said...I would love to have a headunit that can play MP3's from a DVD!
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