Hadn’t seen this anywhere until today,

… announced by Robert Llewellyn for Grant Naylor Productions this week at the UKTV seasonal press launch, the project is a short series of brand new specials to celebrate the 21st birthday of Red Dwarf.
Doug Naylor will be masterminding the four half-hour instalments, and the regular cast will all be reprising their iconic roles. They are being made by GNP for UKTV’s free-to-air channel, Dave – our new best friends!

Full details here.  But basically, it’s 2 x half hour real new episodes with the original cast, 1 x half hour behind the scenes thing and 1 x half hour ‘clips’ show.  Check the article for full info.