since I can't play and try it I don't know if it has changed.... but I have a question to HTC:
changing arenas in the past required a complete exit-out of the game, then come back in to the arena you choose. is that still required?
if so, I would make the suggestion to change it somehow in the situation a friend or squadmate logs in to a different arena and you'd like to join them, or have them join you. I know it is all about what terrain is loaded in memory and all, but I was hoping there was some "coad" you could put in to dump the loaded terrain on exit of that arena.
also, there has been talk about a multiple arena wide squad channel for inter-arena communication. perhaps now is the time to re-visit the radio. many times others have been asking for another vox / text channel. I would suggest a tunable text only channel for tuning in the 300-400 range or something.. a channel where you can talk cross country / arena. with that not only could squads find each other, but buddies too.