I may have been mistaken, but I remember discussing prior to release that while you cannot change characters or body types mid-match. You would be able to change your character and body type between matches, and specifically change them after knowing what map you will be on in the next match.
So, say I am playing public free play, I finish Container City and I see that Sec Tower is going to be the next map.
I had been playing a light engineer, and I want to play a heavy medic for sec tower. I have a different character that is built to be at least a slightly better heavy medic than my engineer character is.
So I decide to switch characters. (or at least body types.)
but as far as I tell to go to either the character selection or appearance menus I need to leave the public group that I am in to make the changes and then there are no gaurantees that I will make it back to that group, that mission.
Yes, I can choose to play with friends, or things might be different if I am in a fire-team, (though I wonder if it would kick me out of the fire-team if I leave the match area).
Can anyone else confirm this game behavior, or tell me how else I may work around this?