This is going to be "too little, too late" for many people. Personally, I wouldn't trust it. Also, when I was a sysadmin deploying this stuff, I used CentOS for systems that I didn't need a RHEL ...
The test and production environments at work are running a Java EE stack (JavaEE apps, JBoss, MySQL) on CentOS 6 machines. But some of the developer machines are running the same Java stack on Ubuntu ...