No idea. But I'm sure they'll give us plenty of notice.
There have been mentions in various places in the forums as to the end of July (after other mentions of this summer without a specific month), but that was some time ago, and I can't see how that'd be possible at this point, without knowing what they know (I'm sure things are much further along than we can see). Maybe sometime in August? It could still be the end of July. It could be September. Or maybe even December!
Who knows. It will end when it ends, and we'll know when it's time to know.
Yes, I too saw stoot post that it was probably at least (which means longer than) 6 weeks away...in another thread. So that would be early Sept at the earliest, but could be longer away than that.