OK
I didn't use yum with --nogpgcheck
and probably that's why I didn't have the expected results.
I did it correctly now and I have the rawhide repo , updated and all went fine.
only now I can't boot,
Its a uefi installation, secore boot disabled.
I restarted after the yum --releasever=rawhide distro-sync and the boot process stoped before grub, I just see a "welcome to grub" message in a black screen and that's it. I'm using refind as boot manager.
I'm now in a chroot env from fedora live cd, this is my repo list:
(chroot) [root@fedora /]# yum repolist all
Loaded plugins: langpacks, refresh-packagekit
Unable to connect to dbus
repo id repo name status
fedora/19/x86_64 Fedora 19 - x86_64 disabled
fedora-debuginfo/19/x86_64 Fedora 19 - x86_64 - Debug disabled
fedora-source/19/x86_64 Fedora 19 - Source disabled
rawhide/x86_64 Fedora - Rawhide - Developme enabled: 35,084
rawhide-debuginfo/x86_64 Fedora - Rawhide - Debug disabled
rawhide-source/x86_64 Fedora - Rawhide - Source disabled
updates/19/x86_64 Fedora 19 - x86_64 - Updates disabled
updates-debuginfo/19/x86_64 Fedora 19 - x86_64 - Updates disabled
updates-source/19/x86_64 Fedora 19 - Updates Source disabled
updates-testing/19/x86_64 Fedora 19 - x86_64 - Test Up disabled
updates-testing-debuginfo/19/x86_64 Fedora 19 - x86_64 - Test Up disabled
updates-testing-source/19/x86_64 Fedora 19 - Test Updates Sou disabled
repolist: 35,084
actually I don't know what to do next.