i just started a death level and it took 40 mins to set up and i got a message saying a new build is available. not the one that says please reload the client.
well it disconnected me after about 1 hour give or take.
was doing the newbie lvl 10 max pvp a while back and had gotten up to around 30 consecutive wins and then it disconnected me saving that the build running was no longer supported.
For PVP, it just doesn't allow you to join new matches if a new build is released but it doesn't kick you from the game (atleast not me), you're just stuck in your last match indefinitely.
I've gone a few hours with an old build and didn't get disconnected. Although you can always manually disconnect your internet or reboot your PC, get the new build and since GW will think you've disconnected it will give you 10 minutes to reconnect, should work in theory.