Update from facebook regarding some of the Third Unit's role in production and why they're asking for donations for studio space.

"As Gordon has said , the shots needed are to replace either bad compositing blue screen work or for a specific added shot. There will be no added scenes (well maybe but only for the special features and not to be included in the movie). Acouple of the things that will be shot by the 3rd unit will be Vader, to replace the terribly composited hologram during the Hoth battle, Vader for a shot near the end where i originally used a shot from ROTS, but the CG cape used in that shot in ROTS is horrendous and a few other shots, including one for a teaser for the prequels:Revisited - Adywan"