The MBP is a different class of machine. This thing is roughly the size of an 11 inch MBA.
I would love to find a 13" form factor convertible tablet PC that's just a bit bulkier than a Macbook Air, but has something equivalent to a Wacom stylus.
(EDIT, Actually, there are plenty of situations where more RAM but not more CPU would be of tremendous benefit.)
Either way, I'd say the high end computing market (which I'd say needing 16GB of RAM falls into, personally) is currently different from the ultra-light, ultra-portable market.
I mean, if you need 16GB, you probably need more than a low power dual core CPU anyway, and that's not realistically going to fit into the form factor of this machine today.
It's tragically expensive to import, though.