There are very few laptops that have upgradeable graphics. If one does it's going to be a rather expensive gaming laptop with limited availability MXM cards. I've known a few people to tear apart their Dell Latitudes to replace the video cards with ones off of eBay but that's not so hard to do.
Well Final Cut Studio works okay if sluggish on my friend's late 07 MacBook and with the upgrades to processor, FSB, RAM and graphics I see no reason why the new MacBooks couldn't run FCS2 if not well then at least not terribly sluggish.