RAF summon works. You RAF yourself and connect, then you can summon your characters to the zones:
It works with non-max level characters. I'm assuming it works up until level 85 (which is where the RAF bonus ends).
This might open up some new cool explorations, because you can use your engineering items etc with the higher level character.
Flying appears to be disabled in these zones. I have 280% flight speed learned, but I cannot take off. Maybe if I get into an unknown-zone...
Updates to come. Credits to Satori and Elektropop for piquing my interests.