I'm hoping for a new build that's the next best thing to the GA build that will be released on the 29th. Or, the second-to-next best thing, if Microsoft releases another build, say, two weeks beforehand. Although I can't imagine _that_ build being much different than what they release on the 29th.
Now, that said, what I'm even more hopeful for is a build that leverages the June firmware update (which I still haven't received on mine) to make the SP3 finally work well with Win10 in terms of battery life, sleep, and general performance. If that build doesn't come tomorrow, then no later than Friday, certainly.