Even though the [character][1] appears in the credits as "Young Man", he talks knowingly to Ezio, takes his hand, tells him he should have courage. He's the only unnamed character in the 20 minutes video. 

I just can't shake the feeling that it's not such a random encounter. So, who could he be?


  [1]: http://images.wikia.com/assassinscreed/images/a/a1/EzioYoungMan.png