The left-handed option isn't a proven fact but it's a pretty big "duh" IMO. Yeah, Tuesdays are mailbag days. Actually, technically it's really late Monday night, but often at like midnight or later, so it's technically Tuesday, and it's intended for a Tuesday update.
I know! 3 out of 6 confirmed just like that! And it's more solid than that, this game is confirmed to cover the origins of the Master Sword now, which means that it's a prequel, not a sequel, to any game involving the Master Sword. :3
The crossbow/longbow one might turn out to be wrong though, although it's not impossible. Miyamoto almost confirmed my prediction about expanded inventory, particularly about OoT's equipment system. It wasn't solid yet, but it was interesting. And it seemed like he may have been dodging a voice-acting question, so that could turn out to be true too!