ac2 spoilers
this strongly suggests that maria officially changes teams at some later point, or gives up the baby to be raised by assassins.
say... i wonder what happened to adha?
Spoiler: Highlight to viewso altair and maria get busy on the tower in king richards citadel. after altair leaves, his point of view stays with maria, strongly suggesting that desmond is descended from altair and maria. we also know that desmond was raised as an assassin, so this strongly suggests that maria's child was raised as an assassin.this strongly suggests that maria officially changes teams at some later point, or gives up the baby to be raised by assassins.
say... i wonder what happened to adha?
To find out what happened to her read the codex pages in AC2 i think #8 or 9 mentions her specifically
ah ok... havent gotten there in the game yet.
unrelated.... i noticed they moved the leap of faith at the top of the tower. too bad. i tried to do an eagle strike ledge grab for ol' times sake, but landed in the haystack instead 
lol yeah I saw it too and I was like awww. At least It's a higher drop into the hay. Yay for my unrealism!
You kind of put a spoiler right in the topic title. Most people wouldn't know that town is in AC2. 
The PSP game Assassin's Creed: Bloodlines fills out the story prior to the sequence you're talking about, including showing how those two got to the social status we saw in Desmond's flashback. The codex pages fill in the rest.
Haha I could just see Ian looking down at that hay wagon like "you'e sh*tting me, right?"