I liked a lot of things in 3e and Arcana Evolved, whereas I liked nothing about the direction taken with 4e, so I'd say my interest in 5e is not very high. That said, I think Pathfinder is a huge pile of splatbooky rubbish (as do those I game with), so there's definitely an opportunity for the open playtest to impress me.
But Monte leaving is definitely something that should send up a red flag, even if you don't like his work. When your lead designer quits at this stage of development (in any sort of project, in any business), that is (usually) a huge, huge sign of deep, systemic problems in your work group.