Craig Charles, and now Robert Llewellyn, have confirmed that a new series of six episodes is about to go into production in November. No indication yet on the network, but given the three special's success in 2009, it's probably set to air on Dave rather than it's old BBC2 home. The main cast members are set to return, no yet word on either Holly or Kochanski.
http://www.dailymail.co.uk/tvshowbiz/article-1348939/Craig-Charles-confirms-Red-Dwarf-new-series.html