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! Dates updated: After a 1.5 year break, this year’s only Advanced Oracle Troubleshooting training class (updated with Oracle 12c content) takes place on 14-18 December 2015 and 11-15 January 2016 (I had to reschedule the start from November to December). So sign up now if you want to learn new cool stuff!