That's quibbling. Irrespective of how you label the devices, a consumer making a decision compares the two devices at hand.

MS never built their own computers, so that's a first there. Also while they tried to market Tablet PCs a decade ago it was always trying to make normal Windows work with a pen (although their handwriting recognition is the best I've ever used). So Metro-or-whatever-it's-called-now is a radical departure from that as well.

I would indeed label the Surface as a Version 1, both in terms of hardware and software.