Pros: The artstyle. Holy smokes it looks gorgeous, kinda like a mix of SS and WW focused on the technologically-advanced Lanayru Desert region. Also, HECK YES, Steampunk Zelda finally here! I am SO looking forward to this.
Con: I'm not a big fan of the huge open-world design aspect, I find it's nearly impossible to create a strong & lasting central story while also allowing for almost total nonlinearity. Stories happen in a linear fashion, one event causes the next to happen in a planned order, and the ones that utilize this aspect best are the stories most remembered. That's what I loved so much about SS, and it saddens me that, out of all the things ZeldaU is taking from that game, the strong linear narrative isn't one of them. Also, huge overworlds remind me too much of Elder Scrolls, and that game bored me to tears because all the locations were the exact same. It's still too early for me to be bellyaching all that much though, and I may be completely wrong in the end, but all the same I am currently apprehensive about this aspect.