Has anyone messed with sharing their task list through Outlook with other people and seeing if they can use that as a workaround to not having sharing yet?
I understand why they're moving away from Wunderlist (i believe ToDo has the same development team, so its not that they're dropping Wunderlist per say). Really, this is Wunderlist v2 and its built off of Outlook Tasks instead of its own database. So while many people are complaining its a standalone app and not integrated, its actually quite integrated. Though this does introduce headaches such as the lack of sub-tasks. Since Outlook Tasks doesn't support sub-tasks, there's no clean way for ToDo to do so without implementing some sort of hack (like markup code within a task, etc.).
Cortana integration is definitely in the works and if you join the google+ page for the android beta, they keep you up to date with what they're working on and stuff. Granted, its for the android app, but the android/ios/windows/web apps have been fairly consistent with each other.
I think it has a lot of promise, but there are definitely big features missing and also could use a little shine too (small things that make a big difference in how it feels). So, only time will tell.