The only difference between this and a current MBP is the smooth top... (unless you consider black keys a huge difference) anything else would require removing the ethernet and DVI ports at least, as they take up pretty much the whole height of the MBP.
Short of removing some of the lesser used components and/or giving it a smaller battery with less longevity just to make it lightweight, I think the MBP is as good as it's going to get right now.
Essentially if you're going to start taking away features, you might as well not stop and then you have the macbook air. AFAIC, the MBP isn't about being ultra-portable or an on-the-go notebook, it's about a notebook that can also double as a main workstation.