You can download it from http://edelivery.oracle.com
And now I (and other beta testers) can finally start writing about the new cool features in it! :)
Looks like only the Linux x86-64, Solaris x86-64 + SPARC ports are available first (as usual).
(just a screenshot below, you’ll need to go to http://edelivery.oracle.com to download the files)
Update: Also the Oracle 12c Documentation is now available in the OTN website.
NB! I am running one more Advanced Oracle Troubleshooting training in 2018! You can attend the live online training and can download personal video recordings too. The Part 1 starts on 29th January 2018 - sign up here!