In less than two hours from now, 4pm EST, the Wrath of Heroes servers will be open for the last test before open beta begins. The final test, dubbed The Open Beta prequel, will last from today until March 27th to 10am EST.
Only beta testers that have been invited so far will have access to this final test. This final round of testing includes updates to the in-game item-store, a new hero line-up, a new UI and rewards for beta testers.
It is unclear whether open beta will begin on March 28th or if there will be a gap inbetween, but we should know more before the end of this final test.