It’s behind their subscription wall so I won’t post most of it.
I think it might be slightly overly optimistic and I expect a pickup of 4 seats next cycle with one district being a swing. Though Wasserman points out only four are safe Republican seats meaning a wave could lead to 14 Dem seats–I think 12 is more realistic. As of right now they are using Obama’s 2008 numbers which are probably inflated over what his 2012 numbers will be and not a perfect proxy for Congressional races.