On Sunday you can assist to the 11g exam cram from 9am to 5pm. It may be too late to register, I tried anyway :
11g db Exam Cram
Then you may want to get your OCP credentials for a discount price.
The Oracle Database 11g New Features for Administrators exam will be available in beta version during the conference. Beta exams are not available at Oracle OpenWorld 2007.
If I read this correctly, it means 11g New Features is available during the conference but not at the conference