I made an ISO from the latest build 10240 downloaded esd file, in the process NOW of upgrading machines. 99.9% guaranteed that it is the RTM, that's what the OEM's have been given.
Contrary to what people are saying in forums and their interpretation of the "official word," activation is already automatic when the machine already had a prior qualifying license. On a Win8.1 machine that had never been signed in with my Insider account and never had a Win10 build on it, upgraded it with the ISO and it's activated and working.
Why wait until the 29th other than for the inevitable patches to be released on Windows Update?
RumoredNow: why is that laptop still in the box?!