Err, new tablet, Surface.
It's 9.3mm thick, but in most shots I've seen, it looks 2-3x thicker than an iPad which itself is 9.4mm thick.
My first impression is that the screen is way too small. They should have gone for something closer to the 10" iPad form factor. Hmm, I think the smallness might again be an issue with the images I've browsed. I just read a quick spec that says it's supposed to be over 10", however in a widescreen aspect. So that sounds good.
I haven't gotten many details yet because Engadget does their liveblog backwards with new content at the top. If it were already impossible to read/follow anything with this kind of layout, the page auto-refreshes so that while you're reading something the text will suddenly jump somewhere else on the page. Brilliant.
One gem I just picked up is that there will be multiple different tablets to cover the different flavors of Windows 8. Troubling.