Who is Saber extending her hand to in the ED of Carnival Phantasm? In the ED, we see each character (that appears in the show) is connected by (the proximity of) a hand.

Right as the ED of Carnival Phantasm ends, we see Saber extending her hand to someone, but we never see who that person is.

Was the identity of this hand ever revealed? If so, who is it?
That arm could be the arm of Kiritsugu Emiya. In the picture the characters are connected to thier masters. The masters of Saber would be Shirou Emiya and Kiritsugu Emiya.

It could also be the arm of Irisviel van Einzbern, who wasn't the real master of Saber but some sort of stand-in, while Kiritsugu was doing his dirty work.

http://en.wikipedia.org/wiki/Fate/Zero#Characters