Choosing One  is supposed to add the dbapi enabled flag in the defaults.xml for you.
Separate installations, the DBA's ran the update and I updated my Tomcat setups, which are different servers.
If you hear they did in fact select option 1 and that didn't enable the db-api, please let me know.
If you're curious as to the change, SQL Developer Web came first, then the DB API.
We're now refactoring SQL Developer Web to take advantage of the DB API end points - and also the DB API is growing in leaps and bounds to satisfy feature requirements in SQL Developer Web.
I heard from the DBA's, that parameter did indeed get added to their defaults.xml.
So I guess everything worked correctly.