The main thing I am curious about is how long each Season is going to last. I have heard people say 2-3 months but knowing Blizzard it could be a year before they patch the game again with a new season. Although I am somewhat excited to start with everyone from scratch it is also lame that it looks like there is a total of about 8 season only items and judging by past design 7 of those 8 will be dogshit shard fodder so it really kills any reason to season at all. Non-season you still get the Gem's, Hellfire Amulet, the new item that adds a weapon socket for free, and the rerolled legendaries but you get to keep all your paragon levels so meh. Seems a shame they didn't add between 50-100 new season only items, and some cool as shit ones that you couldn't wait to get your hands on.
The new goblin greed rift trivializes money so that's a plus for anyone not already sitting on 50 billion gold, and the greater rift system seems cool enough. I am pretty sure after the 100th GR people are quickly going to go back losing interest, time will tell though.