As it is,there will not be news about the Sandbox testserver. Wargaming has decided that it is not allowed to share information about the test, at least not for the time being, so maybe it will change later. I’ll start playing on the sandbox on monday after I’ve completed my weekend activities, and if the NDA is removed at some point I’ll post stuff.
I think it’s understandable for WG to limit the sandbox information, as the changes might be very drastic compared to the current live servers, and not everyone seems to understand the sandbox for what it is: a platform for testing radical changes. Already, for the little tidbits told, have caused quite a lot of ruckus about the playerbase, so it’s probably best to keep the specifics of testing hidden until there are some solid results to tell.