the difficulty of story mode, was said to be around T9 with the beginning echo (the 5 or 10%) which is still a challenge to most and if it took you 4 months after patch then this would be around the same level you may of faced with T9 so it should be entertaining, and IIRC, i beleave they said it was in-between T9 and Savage T6 to T9 for the hard mode, where it is a challenge to those who farm t9 savage, plus do not forget the thing isn't for another 14 weeks, and not only that but we don't know the mechanics of the bosses or anything of alexander :P so i wouldn't worry