From the Fate/Zero novel, a prequel of Fate/Stay night, which explains the events in the forth Holy Grail War, comes Saber in a dark, cold suit. Completely different to any Sabers we've seen before, her stiff personality has been excellently sculpted based on the original illustration. It is also possible to let her wield Excalibur.
Her master Kiritsugu Emiya will also be available to complete the Fate/Zero combo.