Yes right now the servers are down, but the next test is scheduled for Sept 15th. Here is a list of the upcoming beta schedules.
September 15th at 12 PM CST - September 19th at 11 PM CST
October 20th at 12 PM CST - October 27th at 11 PM CST
November 15th at 12 PM CST - Servers stay up 24/7 until Early Access begins