There are rumors that says the we can upgrade from RHEL 6 to RHEL 7 with a simple
yum update without any needs of a fresh install.

Is there some official statement on this?
I would like to have more info on this.

Since I use CentOS instead of RHEL I think that I need to wait RHEL6.5 before thinking on RHEL7,
but some info would be appreciated.

An official statement would have to come from RedHat, not Linode. I can't find any official statement from RedHat on the matter either.

Probably I'm not explained myself well,
I'm searching for someone who have seen an official statement from RHEL

Thanks for the reply.

Seems unlikely.

All previous version updates required a fresh install.

_________________
Either provide enough details for people to help, or sit back and listen to the crickets chirp.
Security thru obscurity is a myth - and really really annoying.

from what I heard, no need for fresh install will be a "new feature".

I imagine this can't be answered until RHEL 7 and its documentation are actually released (later this year?).

In place upgrade from 6 to 7 is indeed a rumored feature:

http://www.linux.com/component/content/ ... techtarget