User blog comment:TheDarkKnightHasRisen/Connor: The child, the apprentice, the Assassin/@comment-3018037-20121007033601/@comment-3168501-20121008032008

It could be Haytham, but....it'd be impossible to be viewing this memory if he's had Connor already, so it's probably or more and likely an older Connor as someone else said. He's probably moved up in the Continental Army (?) and received better clothing to represent his status.

Unless, unless, unless it's like AC 2 when we witness Ezio's birth and everything, just a sort of speculative view of the time before the actual character is born.