Jim,
I haven't found any responses to this so far. Which I assume means you had to do conversions by hand?
Did you happen to look at using Data Interop? And any luck with that?
Or have you found an alternate method. From what I can gather, just creating the spatial type doesn't populate the data.
We have data in 10.1 and we extract it into file geodatabases.
While doing some testing with Hosted Feature Services, I discovered that some of our polygons don't have ST_GEOMETRY data so I assume we need to do the conversion like you've had to deal with.
I haven't come across any info about the change to 10.2 so if you have any references, I'd appreciate that.
The best thing I've found so far for basic information is:
Feature classes in a geodatabase in Oracle—Help | ArcGIS for Desktop