Revit 2014 UR2 is now available in-product through the communication center. See image below
You can also access it by clicking on the Communication Center (Radar) button and selecting the "Product Update Available" line item. It may not be at the top of your list so scroll through to find it.
There are a number of minor fixes as well as a few significant algorithm improvements in the automatic Energy Analytical Model generation used for whole building energy analysis. You can find more about the algorithm improvements on the BPA Blog.