The third link is not actually a link, since the <a> tag is missing the href attribute. I wanted to check what the CEO actually said, since "unify" could mean a lot of things.
Are they going for x86-64 only, killing the ARM-based WIndows RT, as Hot Hardware is reporting? They'd still have to keep ARM support for Windows Mobile. Perhaps they should have put Windows Mobile plus some tablet extensions on the low-budget tablets, that would have fit people's expectations a lot better.
Are they going for a single code base? In that case there would be multiple products created from that code base, so that doesn't tell us anything about the fate of Windows RT or any other specific products.
Are they going for a single product named Windows? While I think it would be good to drop the artificial home/pro/ultimate differentiation, having a different Windows for client and server use is still useful. Although that could be handled by having a different default configuration rather than an entirely different product.