This new series has three guests on each programme who are fighting it out to get their things into the room. The guests are:
January 20: Danny Baker, Fern Britton, Robert Webb
January 27: Gregg Wallace, Gabby Logan, Sarah Millican
February 3: Chris Packham, Chris Tarrant, Alice Cooper
February 10: Ross Noble, Jamelia, Germaine Greer
February 17: Alistair McGowan, Hilary Devey, Josh Groban
February 24: Nick Hewer, Carol Vorderman, Rhod Gilbert
March 2: Larry Lamb, Lauren Laverne, David O'Doherty
March 9: John Prescott, Micky Flanagan, Rebecca Front
Out of those, Danny Baker, Chris Tarrant, Ross Noble and Germaine Greer have all been on previously (the only other returning guest being Ian Hislop).
Interestingly, according to DigiGuide, the episodes are all pre-watershed (20:30).
EDIT: The BBC has issued a press release with more information. Turns out there will also be extended repeats.