Ok calm down and don't get too excited. it's not what you think. Yes Blizzard will be making a PvE to PvP server transfer possible but not for all realms. It's actually being done as a drastic measure to keep the faction balance in certain oceanic servers. Here's CM Bornakk for the 411 on this matter.
To address faction imbalance issues on Oceanic PvP realm Thaurissan, we will be offering free character moves for Alliance players only from Oceanic PvE realms Nagrand, Aman’Thul, and Khaz’goroth to this realm. This transfer opportunity will open on Thursday, June 12, and is scheduled to end no later than Thursday, June 19. During this timeframe Paid Character Transfers to Nagrand, Aman’Thul, and Khaz’goroth will be disabled as we focus on resolving the issue at hand. In the event that we meet our transfer goals before the scheduled end date, transfers may be disabled without prior notice. No additional characters will be eligible for these free moves once the transfers have been closed.
Once the transfers open, you can begin the process by visiting the Character Move page. (https://www.worldofwarcraft.com/account/character-move.html) source
The faction imbalance in those servers must be really bad for Blizzard to allow this kind of transfer. It certainly is a drastic measure since a PvE to PvP server transfer usually isn't allowed in normal circumstances for fairness. A character who leveled in a PvE server wouldn't have had the annoying issues of getting ganked and therefore had an easier time. But they made the rules so I guess they can break them once in a while if the situation calls for it.