I'm all for making Zelda more open-world. I'm scared of anything coop creeping into Zelda. It can kill the game dead for me, if it gets in the way of solo play.
Wind Waker HD. Buy a new system, buy an old game again. No thanks. I'll wait for new stuff I want before I consider buying anything. I suppose the Tingle stuff will go into the pad screen. (Before, you needed a GBA and link cable.) That could all end up pretty cool for new players. If the new Yoshi is more like Story than Island, I probably won't want that either.
Still, it's good to see some progress on the horizon. It gives me hope that Nintendo and their new console will stay relevant.