Regarding the insane changes to itunesconnect.
When you successfully upload a build from Xcode,
Some partial information ...
a build submitted at 1606 did appear on the "prerelease" area at 1651.....
(So, 45 minutes later.)
How did I make it happen? Over on Xcode, I took the same archive, and clicked validate, let it process that, and then clicked submit again. Half way through, the "first" one (from 45 minutes ago) did appear as shown here on the "Prerelease" section. I then just clicked to cancel that second upload (I guess it would have been harmless anyway.) Coincidence? I don't know, but it worked.
So now - it's stuck in "prerelease" section! :O
if you have an App that Waiting for Review, the New App that you create and you upload... it will not Appear on +Build until the first App " Approved or Rejected"
I had the same issue and now I have solved.
The reason for that is that your build is missing something that apple servers is unable to determine.
to solve this, make sure you have included all possible settings needed for your app submission, and make sure you have added at least one of the launch images for every possible resolution, that was my case, I added an launch image for every device and did works.
so, carefully check if you project is missing one of those settings or an image, and try. thanks