The last update we had on frontlines:
Chat channels
While participating in Frontline, certain chat channels will be restricted.
-Tell/LS/FC chat channels
It will not be possible to use these chat channels as we would like to prevent players that are in different Grand Company groups from leaking information such as player position, job setup, etc.
-Say/Yell/Shout chat channels
These chat channels will be available for use while in Frontline; however, only your group will be able to see it.
Queuing
As long as you are part of the same Grand Company, you’ll be able to queue up with others.
Source:
http://forum.square-enix.com/ffxiv/t...=1#post2227258
Though Camates original post seems to be gone.