From looking at the tree itself, it seems like the Mind area focuses on slows/freezes and thus it requires range and kiting while hitting a mob otherwise the slows and freezes would have no use. Well they do have an aoe, and that would be a plus in both PvE and PvP. You can always test out a pure Mind talent build or mix it with Divinity and/or Chasten. I do not have any idea if a pure Mind one will work out well, because I'm basically not going through that path.
^ Yeap, and that would help a lot as well especially if you happen to queue for a random party because you really would not know there on who your mates will be, or if there will be another priest to aid in healing/damage.
Well, it's grand, but you might wanna take the 5 points out of Freezing Light and transfer it to Heart of Frost. At later levels your skills would be more likely to miss, well I actually have witnessed that already on several occasions on my priest.
Oh, and are you looking forward to attacking a lot in PvP? If yes then you might want to put points in Icy Clarity. I believe it will help your teammates to reach the other opponents as well as the aoe goes on a farther range.
I would want to tweak it up a little bit more, but my own build would be exposed xD You can change and reset your talents anyway once you get to know what suits better. Goodluck in your priest