One of the challenges with previous releases was, that SOA & BPM composites couldn't be deployed and tested on the JDeveloper integrated Weblogic server. Therefore a separate installation of SOA/BPM Suite or a virtual image was necessary to start developing. Now with the new release Oracle introduced a single-click installer for SOA & BPM Suite. Among other new features (like debugging & testing capabilities, templating, optimized foodprint, etc.) this really helps to increase developer productivity.
The video below demonstrates that with Oracle SOA & BPM 12c it just takes 15 minutes to get started - install JDeveloper, start the Weblogic server, develop a simple Hello World, deploy the process and test it from Enterprise Manager.
Do you feel inspired? Just download the software from OTN and try it yourself (SOA-Download; BPM-Download). Have fun!