I for one hope they update the default smbios from Mac Pro 3,1. Seems a lot more people need to update from that than would need to go back to it. I know it's for Snow Leopard compatibility, but that's got to be a very small group. Auto detection would be nice, but that's probably not feasible with the limited space the bios has to work with.
thats been possible since the Defaults.plist option was introduced.