Yes, it has been out on Region Two since August 2003.

My copy is out on loan just now, extras on this version were (according to amazon uk)

° Audio Commentary - 1. Michael Cimino - Director
° Trailer - 1. Original Theatrical Trailer
° Documentaries - 1. REALISING THE DEER HUNTER
° 2. SHOOTING THE DEER HUNTER
° 3. PLAYING THE DEER HUNTER
° Stills Gallery