[Centos] 3.3 -> 3.4 transition

[joey@xxxxxxxxxxxx (Joe Pruett)]

maybe some of the 3.4 beta discussion has covered this, i wasn't watching 
it too closely.

what is going to be the process to convert a system from 3.3 to 3.4?  
will a simple yum update work?  or do we have to do something more
intentional to make it happen?  how does redhat handle u3->u4 updates?  i
assume that since u4 has been published that security patches from rh will
only apply to u4?  or do they also supply security patches for u3 for some
period of time?