After a long wait Fedora 21 Release is a few days away, since alpha has been testing Fedora 21 on virtual machines, with no real issue how ever do to my work load had not time time to upgrade my main notebook.
Today run fedup and upgrade run flawless, simple upgrade instrucion:
sudo fedup --network 21 --product=workstation
Notice the additional parameter added to fedup for Fedora 21, values are workstation (Gnome desktop), server, Cloud and nonproduct which let fedup work as in its previous version.
After downloading 3248 packages a warning about some external repository packages dependencies nothing critical, reboot and about 30 minutes waith, until upgrade process finish at the end it greet me with this beefy miracle asci image.
Next reboot and I was running Fedora 21 Workstation. It works fine. Thanks to all the effort and congrats to all involve into this release, it is looking really great.