SE doesn't actually react to anything we report on the test server, so it's a waste of time for them to continue to develop half-versions and release them for us. I expect one of two things will be announced in the coming months:
1) Test Server shutdown
2) Restricting the test server to JP clients

I'd bet more #1 than #2, because SE already doesn't translate most of the stuff that they put on the test server so restricting it to JP client doesn't actually decrease their workload very much.