That error is because it can not find the file named "True" that is specified on the kernel line in the SYSFONT=TRUE parameter that is on the alpha releases.
I changed mine back to load the latarcyrheb-sun16 font like previous releases did.
What I did...
replaced SYSFONT=True with SYSFONT=latarcyrheb-sun16 on GRUB_CMDLINE_LINUX= line
grub2-mkconfig -o /boot/grub2/grub.cfg
There is already a bug filed on this issue, but you can add to it if you wish.