Last year I took the beta exam for E-Business Suite Release 12, Install, Patch and Maintain Applications. Unfortunately I failed that exam, but I didn't prepare at all. In fact, I found out about the beta exam one day before the beta program ended...
Now I took some more time to prepare for the exam and passed with 82% score.
So, as of today I am officially allowed to call myself: Oracle E-Business Suite Release 12 Database Administrator Certified Professional.
The exam was very appropriate: Proper level of difficulty, good questions, some pretty hard, I must say.
If you want to prepare: Take the course (Install Patch and Maintain Applications), learn all the new features of R12, the new file locations (logfiles, etc), and make yourself familiar with the managment tools around R12. Then you should be able to pass without too much problems.