rawhide users' actions because of core and extra merge?

[Gianluca Cecchi]

just to know if anything is to be manually done by rawhide final users
or if the yum repos configuration will be done in a sort of automatic
way through updates when mirrors become available after the merge.

And also if one is now rsyncing rawhide to better simulate daily
installations/upgrades, what kind of action is advisable for both not
to saturate mirrors and not to destroy local repository....

thanks,
gianluca