I am fairly sure that all of the newer motherboards will be covered by the UEFI upgrade but possibly not the older ones that will reach EOL sooner. I would suggest that you contact GGTS and ask if a particular motherboard will be updated if there is one that you are considering.
Thanks much for the reply. As you suggested, I wrote to GGTS. Hopefully they'll respond back with news regarding whether GA-990FXA-UD3 will be among those motherboards receiving UEFI.
Thanks again!