Hi Tom,
We're working on the documentation now, so the new financial metrics and other new features are not defined in the Beta version.
The "LPPA" metric is levelized PPA price, and is equivalent to the nominal LCOE in SAM 2014.1.4 and older versions. We decided to report two metrics in the new version: The LCOE is the project's levelized cost of energy and does not include project returns. The LPPA does include project returns. In older versions of SAM, many people found the LCOE metric to be confusing because it did include project returns.
Best regards,
Paul.