Iīm not sure thatīs Subject 16, itīs just Desmond.
The graphics have been improved and Desmond face has as well, this time to maximize the visual differences between mature Ezzio, middle age Altair and most young of all Desmond.
Heīs got more beard because of coma thing I presume, so as a little longer hair if you compare with an image of him in previous games. Besides, that guy is dress just like Desmond.
I will really love to see actual appearance of Subject 16, but something tell me thatīs not going to happen. Hope Iīm wrong.
But most definitely that guy in trailer is Desmond.