This is a hypothetical scenario. Let's say you decide to wait for a revision. In a few months a new MBP line is introduced with hardware revisions. But, wait, you don't want to be an early adopter because there are usually issues with a new product. This occurs with all manufacturers, not just Apple. You watch the forums, and sure enough, there are glitches. After a month, or so, Apple releases a software update, but that doesn't really fix everything. Then, after another month, or two, Apple releases a firmware update, which fixes the oustanding issues, but has other unexpected side effects. Another software update is eventually released which appears to some of the issues. Then another update is released to address all remaining bugs.
Finally, that MBP series is a fairly reliable stable product, so you decide it's time to buy, but wait. Six or seven months have passed and the Buyer's Guide advises not to buy as that series is reaching end of line, and a revision should be coming soon. And the cycle repeats.
Personally, I think now is the time to buy, and I did so. A little over two weeks ago I bought a 15" MBP with 2.8GHz i7 CPU and hi-res anti-glare screen. This is the only configuration the Apple Store has with the anti-glare. It appears that Intel has done core optimization on the i7, because I have found this CPU to be fairly cool running and energy efficient. The screen is excellent, and the machine is very quiet. Also, the fit and finish of the case and lid is immaculate.