This is the final draft, the actual report will be released sometime in 2014. For those who think it's funny that the Summary for Policymakers (see below) is published before the completed report is released, that's just the way the IPCC rolls.
From the Intergovernmental Panel on Climate Change:
Climate Change 2013: The Physical Science Basis
Here's the Working Group 1 link page.
Report by Chapters
The Intergovernmental Panel on Climate Change: Summary for Policymakers September 27, 2013