I managed to load up fine and get into a PvP match straight after patching, but got a ’network error’ partway through the match (while still very definitely connected to teamspeak and hearing my allies struggle in a 4v5). After that crash, I’ve not been able to load up the client as far as the character select screen (though I can still log in on the splash window).
Uh-oh.
EDIT: I can log in fine on my NA account, at least for now. This presumably means it’s a problem with EU servers?