Looks like it could be a very interesting book though, if it's written top to bottom, and not just a bunch of his blog stuff lashed together with duct tape and twine.
I recently read The Lean Startup, against my better instincts, and was duly disappointed. A few key ideas and lots of what felt like hand waving to me. I think Eric is the real deal, but somehow managed to produce a book aimed at the management of large companies, rather than people running actual startups. Steve's book, on the other hand, promises "lots of details" and "metrics that matter". Hopefully, actual things that can be measured, rather than "innovation accounting"...