Hopefully a reboot will activate it if you are coming from a valid 8.1 or 7 system, if you aren't you are on your own and who cares? If you have to wait two weeks for the activation servers to come up, so what it won't expire that quickly.
zdnet assures the RTM reach too. hxxp :// www . zdnet . com/article/microsoft-windows-10-for-pcs-hits-rtm-sources