We are working on a system to allow cross-realm grouping, yes, as we have regularly seen complaints in the past regarding players having a hard time finding a group for the dungeon they want to run. We have seen a lot of success with the cross-realm battlegrounds and want to apply that to dungeons as well. While the current LFG system works alright, it’s not really intuitive so a lot of players just avoid using it all together.

We are still working on ironing out the details of this new system and plan to provide a more comprehensive breakdown on it in the future.

Most of the issues that players feel this will cause are things that are already happening to some degree and we will monitor the situation and make changes as needed.

We will have more details on the system in the future as some things still need to be ironed out and then tested. Overall the complaints we are seeing here are not unexpected but also maybe a little overly cautious, we will see how things go when it is all implemented though.

(Source)