This Jill thing... its obvious that shes in the game. IMO its obvious that you will save her also, like in Res4 when you saved Leon + Ashley with the laser thingy... Look at the ps3 trophys for the game "masters of removing" this is almost definately a reference to jill who is the "master of unlocking" also the description of the trophy is "save someone special"... kinda adds up if you ask me