Just created my first Extreme Performance 18.104.22.168 database in the cloud.oracle.com.
So just after a day (within a day?) most of the manuals of 22.214.171.124 went online, the new 12.2 database is now also available on the DBaaS Oracle Cloud offering.
Have fun via “free trial options” or a new instance via your DBaaS account. See database version in the screenshot below