who knows how many builds are made daily, I would wager a guess that not all builds get loaded into build feed. OR, MS being MS CANNOT COUNT FOR
They probably hitted a milestone and will be releasing build 10065 or 10100 to Windows Insiders at Build 2015. On the other hand, earlier today, build 10061 in the fbl_impressive branch is being reported to be in the Slow Flight (ms-vnext.net/Flights/) which is a strong indication that that's going to be the next build, and coming before Build 2015.
I've seen builds being reported to Slow Flight several times, but only a few of them got released to insiders.
Build selected by Microsoft will be the only which will be released to Insiders!! All others are just for MS internal use!
I know this. I was just replying to Studio384, who said "it's a strong indication that that's going to be the next build".
I'll wager it is in cognizance of the idea of the Windows nomenclature like what happened to Windows 10 instead of having Windows 9.
I don't think that is how Buildfeed gets the builds information. In fact, that registry changes are in this particular build 10061 by default. What they do is to help linked to next build along that specific build version.
How written by abbodi, the registry trick is the base (obviously with the same version), after this is done just open DataStore file.