[Nov 6, 2007 update: If you are ever uncertain as to which JDeveloper patch to use with which Apps 11i or R12 release, see Note 416708.1, How to find the correct version of JDeveloper to use with eBusiness Suite 11i or Release 12]
My hardworking colleagues have just released a new update to Oracle JDeveloper 10g with OA Extension for E-Business Suite Release 12 environments. The latest update refreshes the Oracle Applications Extension to support Apps 12.0.3 and ATG RUP 3.

The latest update is released as:
- 10g JDev with OA Extension ARU for R12 RUP2 (Patch 6509325)
- E-Business Suite Release 12.0.3
- Apps Technology 12.0.3 Update (R12.ATG_PF.A.DELTA.3, Patch 6077669)
A plethora of information on personalizing and extending OA Framework-based applications for E-Business Suite Release 12 can be found in this documentation roadmap:
- Oracle Application Framework Documentation Resources, Release 12 (Metalink Note 391554.1)
- Using Forms & Reports 10g Builders with Release 12
- Personalizing and Extending Release 12
- Four Critical Changes for Customizations in Release 12