Salute!
Its already open, but if you just tried -> Well, they're patching these hours...
Uhm, and that "Please wait untill beta 5 starts" message you get when you login, just keep trying - and you'll get in, eventually.
But for now, give them a few hours to complete their patch, and welcome to Vanguard: Saga of Heroes ~ Amadeus style...!
~
. Any of you know when that is supposed to be?