Here's the description:
This exclusive image reveals for the first time the nature of guest-star Sophie Winkelman's character. Named Katerina, she's a surprising addition to the crew - a resurrected hologram of a Red Dwarf science officer intent on replacing Rimmer.
That's right - she's Arnold's nemesis!
My own two cents - Katerina, Arnold and the set all look delightfully Star Trekian. If writer Doug Naylor is following the 1970s Star Trek films, as I recommended he do on my personal blog, as a blueprint for rebooting his own science fiction franchise, he could go in much worse directions.
ADDITIONAL: Here's another shot released by Dave. This is of the main character Dave Lister (played by Craig Charles):