As a developer on the go, the larger the display the better. It makes working with code, database, and graphics much, much easier than constantly scrolling around on a too-small display. My last three laptops have all had high-resolution 17" matte displays (glare washes out tiny text very easily).

I'm hoping that a new 17" RMBP is forthcoming, and that it's just a matter of waiting larger Retina display yields. Regardless, I'm still disappointed with Apple's non-announcement regarding 17" MBPs, as well as its decision to not even both with a processor-bumped version of the existing 17" model.

Without user-upgradeable RAM, there's no way I could justify the cost of a 15" RMBP. MBPs are already priced at a premium, but the RMBP is exorbitantly so. I'd be more than willing to forgo an extra mm or three in thickness to get a user-accessible RAM slot, which would also provide additional room for a bigger battery to boot.