Sure, but SR has just been launched, and it represents close to NOTHING in terms of gains to normal users...the next MBPs will get it, not MBs which were already due for an update some months ago.
That's why I said "onboard or separate"...Apple can improve the MB's video without relying on another damned Intel buzzname...just stick some low-end GPU and I am fine. NOBODY will care about improved front-side bus or whatever...MB users just need a slightly better GPU, nothing else.
An 8400 would be lovely. But the x3100 is a "slightly better GPU" compared to the 950. Nothing to do with the FSB, the graphics chip itself is better.
And SR/socket P C2Ds offers much better power management (which equals longer battery life) so a better GPU isn't quite all that would be better for the "average consumer" in a SR MB. Even the CPU would see a small speed boost due to the increased FSB.