As it is indicated on every changelogs :
Since the server pushes update notice to different serial numbers by batches, it may take some days for you to receive the FOTA notice. Thanks for your patience.
For those that just can't wait, there is a thread on XDA where someone has posted a link to the OTA file.
If you can't find that on your own, and figure out how to install it without any help, you probably should just wait patiently.
And that seems to be only the WW version.
As Asus has not yet posted Release Notes, I would be careful, don' t want to flash the wrong version, now do we.
Personally I can wait a few weeks, let others find all the bugs for me.