The current build of the 8.0 Test Server is coming to an end this evening, Tuesday the 11th, at 23:00 PDT. You will not be able to access the test server after the shut down.
We anticipate the release of the next iteration of the 8.0 Test Server to come up on September 13th. A precise start time has not yet been finalized, but we'll keep you informed.
In the mean time, make the most of these last few hours!