Preupgrade failed due to a bug related to anaconda. I downloaded the DVD version of Fedora 17 Beta RC4 and attempt to upgrade the system. It turned out nouveau driver is broken for Nvidia Geforce GTX 460 v2 forcing the use of vesa driver. As a result, Gnome Shell ran on fallback mode until I installed Nvidia driver from rpmfusion repository.Laptop Toshiba Satellite C650D APU: AMD E-350 with Radeon 6310
Running preupgrade was smooth. The newer kernel seems to resolve a battery consumption issue.