I just installed the RC2 build yesterday. The installer correctly identified the efi partition. There was no option to reformat this partition. The boot loader section if the install failed to work and listed the options to enter at the grub command line. Booting via the grub cmd worked and the working system was able to immediately populate the grub bootloader. Not sure why the installer had this issue but the installed system didn't. Can someone point in the direction of any log files or other details that would be helpful in a bug report?
Thanks,
Ian