I heard Apple's next plan was to release the gap between Macbook Air and Macbook Pro.
And besides, if I waited for a new laptop they would just up the prices on whatever is new. Something better than todays 15 inch would cost like $1700.
But I will definately go for that top notch 15 inch. So I have the 512 mb
I expect the $1530 Mac to play games up to 2-3 years from now. I am fine with that though. I have a friend who had a laptop 5 yrs old that could play Starcraft 2, and Skyrim. So it's possible some games on low that far in advance will work. And SC2 and Diablo 3 have a long lifecycle since the games are so big the projects take long to make the next one in the series. D2 and SC2 had 10 yr cycles. Guild Wars had 6 yrs.
I've been a mac user for 10 years and I've yet to see the day when a new Apple laptop is more expensive than the one being replaced.
Even if they change the gap between MBA/MBP it's most likely to remove optical drive which is the only thing they need to remove to do a slimmer MBP 15".
You're probably right on being able to play most games 2-3 years if you can settle with low settings, my white macbook with geforce 320m is still able to play most games on low.
Top notch 15" inch is 1GB btw.
If you really need a computer off course buy it, but most likely new generation is tops 2-3 months away and will probably be a big leap in both GPU and battery time. Since you see this as pretty longtime investment I would personlly wait (and I am, really hoping for a nice new 15" to replace my macbook)