I've yet to understand what's the point of touchscreen laptops. I know that Metro makes more sense with touch than with a mouse, but it gives no productivity gain unless you're using a device with a tablet form-factor that doesn't always have a keyboard attached to it (like the Surface Pro).
If you're going to put this in a laptop that has a permanent keyboard, all you're doing is adding thickness, cost and fingerprints to your laptop, without any productivity gain. In fact, it's probably also faster to use a regular start menu like in Windows 7 than to have to constantly switch between Desktop/Metro mode and your trackpad/touchscreen on a Windows 8 touch laptop.
The Yoga can be folded into a tablet, but it's going to be so big, thick and heavy that I don't know why you wouldn't simply buy a cheaper standard ultrabook as well as a tablet. Do you really picture yourself holding 13.3", 3.3lb "tablet" and reading an ebook on it while taking the bus? The iPad 3/4 could be way more comfortable to use if it was lighter, yet this thing is more than twice the weight. Could you imagine the clunkiness?
I personally use Windows 8 on my rMBP with
Start8 to disable Metro which I can't stand. All that Metro/touch laptop/convertible hype seems like a solution to a problem that didn't exist IMO.
Windows 8 and the Surface currently have disappointing sales and I'm wondering if Microsoft will continue to push into that direction or abandon the idea like they abandoned Windows XP tablet edition and the Zune.