Why wait for the next laptop? Upgrade yours now.
I did the upgrade to my Unibody 15'' MacBook and the difference is amazing. It is the best upgrade I ever did to a machine. No more bouncing icons until the application starts up - all applications start instant without wait (even Photoshop). SSD upgrade is so much better than any other memory/CPU upgrade (of course it is also the priciest upgrade) ... and thanks to CCC the upgrade is painless and fast.
Bottom line: the benchmark results probably havent changed too much, but it feels soooo much faster. I rarely wait for an app 'processing' something - but waiting for an application to start was always annoying.
I concur that the Core i7 15 inch MBP is amazingly fast. It makes my mid-2008 MBP seem like a dog in terms of both performance and battery life. I was literally stunned by the difference.
That said, if you just want portability and great battery life doing light tasks, I think the new MBA's are a home run. I also concur that the benchmarks posted are of little worth in terms of real world usability. The 320M (also in my MBP) makes a huge difference and the SSD will provide for near iPad-like instant on and responsiveness.
All in all, a nice package. I ordered the 11 inch for my own use and will report back when I get it.
SB