Don't be so sure about it. In June Nvidia will launch it's Fermi mobile cards.
Since Apple is so in bed with Nvidia and refuses to use ATI cards, I guess around June-September, a new big improvement in graphics performance can be expected.
That's just something that I'll think will hapen.
Apple's obsessed with battery life; no way they'll slap fermi's in MBPs - not to mention I'd cringe to think the heat they would produce in the thin MBP enclosure. As Apple always does, the next refresh will be another rebranded nVidia solution or maybe something from ATIs mid-tier.