Blizzard's Battle.net launcher will now allow you to add, manage, and chat with friends from around the world, though you will only be able to play with those in your current region.
Added in an update yesterday (and seen by Wowhead), Blizzard Launcher will no longer restrict your friends list to your region. An example screenshot in the launcher patch notes reveals that all the friends you have from outside the region will have their location next to their current activity.
But while you can now chat and keep track of your friends from overseas, we're not at a point where you can play with them. All Blizzard games are still cordoned off with regional servers, restricting characters and accounts to the continent where they started.
Of course, China will also stay in touch with the rest of the world, both within the game and in this new global chat ecosystem.
Maybe one day you'll be able to meet a WoW party from all over Europe, Asia and America. But for now, Blizzard has no plans to move in that direction. At the very least, you can now chat together following your own paths.