I don't remember.
But, according to people at GameFAQs and Neogaf, we know this info:
1> You can choose Male or Girl.
2> Renewed Persona graphic.
3> Different event for girls part.
4> New BGM + pink color for girl.
5> Male version of Elizabeth.
6> New costume - Yukari's mini skirt Santa, private cloth for girl MC...
7> 5 levels of Combat difficulty.
8> Direct command to party member.
9> Simplified map. (menu select?)
I loved P3, so I'm not unhappy about this. I wouldn't mind a P2 remake, though.