[CentOS] RHEL 6 <-> CentOS 6 ?

Hi !

We are curently deploying an 8 nodes cluster where we have a RHEL 6 license 
at great costs (~14 k$/y). It will be our new production environment for 
mission-critical services.

Now our aging developpement server (old p4 with 1.5 gig of ram) need to be 
updated. We will be installing on hardware as close as possible to the new 
production servers, just not in a rack...

For the developement server, I won't be needing the RH support (and price 
that goes with it). So I wsish to install it under CentOS. But 6 isn't out 
yet. (by the way, when ;-) ?). I do have a spare slot in my rhn that I can 
install the new server with.

Will RHEL 6 be as easy to switch to CentOS 6 as were RHEL/CentOS 5 ? That is 
install a couple of rpms, yum update and voilà ?

Thanks,