Vaneras on the EU boards has announced the start of the Cross-Language Battlegroups testing. It is currently only available on the PTRs and Blizz are keen to get your feedback on the matter. See the announcement here.

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Bornakk also announced a brand new PvE realm, Borean Tundra, has opened. Players will NOT be able to transfer characters there or make Death Knights for 3 months unless they have a level 55+ character there. All in-game events are intact, such as the opening of the Ahn'Qiraj. Read more here, or after the break.
Cross-Language Battlegroups

  Blizzard Quote: (Source) 
 As previously announced, we’re working on implementing Cross-Language Battlegroups (CLBG) to increase the size of most Battlegroups. You can reach the original announcement here:
Cross-Language Battlegroups

This new feature has completed internal testing and is active on the Public Test Realms (PTRs), allowing players from the different PTRs to meet each other in Arena and Battlegrounds.

We would be very interested in hearing your experience with the CLBR in the following thread, and especially any issues you might have encountered, such as having players from another PTR join a Battleground on the same side as you:
16/01 Testing Cross-Language Battlegroups

Please note that this feature is not tied to patch 3.0.8 which is also currently on the PTRs, and may not go live at the same time.  
Brand New PvE Realm - Borean Tundra

  Blizzard Quote: (Source) 
 We have opened a brand new PvE realm, Borean Tundra, for those players looking for a fresh start! As a fresh realm it will not be open to paid character transfers or Death Knight character creation (unless a player reaches level 55 with another character on this realm) for three months, and in-game events like the opening of Ahn’Qiraj will be waiting for players to be completed. This realm will be part of the Emberstorm battlegroup and set to the Central timezone.

Enjoy your adventures in Azeroth!