It seems that Oracle's focus has moved a bit from Oracle ATG only to Oracle Commerce. As such the forward looking information (of course accompanied with a good safe harbour statement) is now in general the combination of ATG and Endeca.
Elements of further integration are much lickely to include:
- structured and unstructured (web content) data integration from Sites to Endeca
- Single Sign on between the backend elements of the solutions (administration purposes)
- integration with Experience Manager for feeding cartridges from Sites
This is in addition to the existing integration possibilities between WebCenter Sites and ATG currently
Oracle WebCenter - 11g Release 1 (11.1.1) (search for ATG in the page)
Hope this is helpful to you!