Please note the v4.0 release is a staggered release like all our releases.
Which means every day a small set of devices are released. The reason we do our releases in this manner, is we support 250+ devices.
If we release all builds at the same time the servers will crash as we will have thousands if not millions of simultaneous hits on the servers.
Official builds usually get released during the last days of the release process.
The release process usually takes about 7 to 10 days. For example, for v4.0 we started the release on 11 June and it will complete for all devices around 22 June.