Pioneer seem to have released a pro dvd recorder/player with rs422 control.

The PRV-LX10

http://www.pioneer-eur.com/eur/produ...nomy_id=43-207

JVC have one too:

the BD-X200E

http://www.jvcpro.co.uk/item/index_html?item=BD-X200E

Both seem to feature RS422 deck control.