Why on earth would he have to resell it? When the next one comes out, so what? If he gets the next one (which despite all the rumors might not appear until Macworld) he'll have waited for the questionable pleasure of buying the first generation of a redesigned machine that would almost inevitably have problems galore.
I'd say he should get his Penryn Macbook Pro now (it was only released a few weeks ago!!!) and get AT LEAST two good years of use out of it before even thinking about the next design. By then, even the newer machine will have had a couple of revisions and provide a more worthwhile upgrade.
I doubt that there would be even a single, solitary task he could do better with the first release of the next generation machine than the present one.
My advice to anyone would be to absolutely avoid a major new design for at least six months until initial problems have been resolved –
Your information is misleading, the next mbp will have different casing but same internally like the logic board, etc.. Also the next montevina platform is a rev b or 2nd rev of the current penryn and if anything will be way faster and more efficient and the current penryn models are the 1st rev a's.