Don,
I finally got Issue # 57, in which Brooks discussed the concept and contents at length. Given the space limitations of the magazine (96 pages per issue). I think lenswork extended is a good idea. If you go to the Lenswork website, they are offering an initial 1/2 price offer on Lenswork Extended. Seems like a nice incentive.
Besides including many more photographs, and longer interview with the photographers, I particularly like the idea of inclusion of color work. There's lots of really good stuff out there and you can pretty much only see it in View Camera magazine, which, of late, has very little else to offer, meaning I can't justify the purchase price for one portfolio.
BTW, I notice Brooks is now including photographer's camera/lens info for each portfolio, to satisfy the hardware junkies. A camera is a camera. I'd like to see the photographer's Film, Developer, Paper choices; it would be much more interesting.
Take care,
Tom