The latest Alpha build is to include PvP testing at level 110;
Level 110 PvP Realm – A new alpha realm has opened up, which includes:
Level 110 Character Templates: Fully upgraded artifacts and ilvl 810 PvP Gear.
No access to Legion outdoor zones except for Dalaran.
Full access to the new Honor System at level 110, including PvP talents and prestiging. You’ll be able to earn honor, increase honor level, and unlock PvP talents. No PvP gear will be rewarded yet.
Battlegrounds are available for queuing, with the exception of Alterac Valley and Isle of Conquest. Skirmishes, Ashran, Rated Battlegrounds, War Games, and all Arenas are unavailable.
In this thread we have the opportunity to discuss the potential class balancing issues from the beginning & can discuss class abilities and talents that may need tweaking to create a greater balance.
With the changes to secondary stats happening;
Secondary Stats on Level 110 Gear – We've modified how Secondary Stats are itemized on gear at level 110, to get players up to the levels of secondary stats that feel good, earlier on. Full mathy details for the theorycrafters here: http://us.battle.net/wow/en/forum/topic/20742704730
Gear will make less and less of a difference, so we can generally get a pretty good idea of where these classes are going to end up balance wise. One of the key balancing issues may come from Tier Bonus sets from PvE vs the bonuses from PvP, however we will not be able to review that until a much later date.