I don't think fear on hit will work on other players in PvP and they will greatly reduce CC in general for it because of balancing reasons. High all around defense and damage will reign supreme so gear with high main stat/ vit/ all res/ armor/ crit stats will likely be used.
I think they will change so much about the game before anyone steps into an arena that it's impossible to predict. But maybe I'm just being optimistic about Blizzard actually eventually trying to fix this game...
Itemization is so messy right now there is no way PvP could work well with it. And I'm not even talking about classes/skills which are at least as broken.
Do you think they will have different levels of pvp like there was in d2? This would make lower end items and more legendaries hold a lot of value instead of everyone only looking for top end gear.
I doubt they will try to implement PvP for levels lower than 60. It'll be hard enough for them to get the level 60 PvP right. If there will ever be low level PvP in the game, it's probably many many months away if not more.