The Heartland Institute's NIPCC interim report has just been published - see here. This is a summary of the new scientific literature since 2009.
I've taken a glance through the paleoclimate bits and it appears to have been put together in a very professional manner. I was blissfully unaware of just how much evidence has been emerging for the existence of a MWP in the world outside Europe.
If I had a criticism based on what I have read, I would say it's over the authors' tendency to slip into editorial mode - discussion of Mann being engaged in "subterfuge" looks out of place in a scientific report.
Lots of people are not going to like the report of course. Peter Gleick, the president of the Pacific Institute, tweets that the report makes him sick and refuses to link to it. Barry Woods and I have politely asked which bits in particular he is concerned with and he has told us that he doesn't need to do this when someone is arguing that the Earth is flat.