SSARS #22 addresses Compilation of Pro Forma Financial Information. This document rolls SSARS #14 into the clarified format. This is the last section of the old SSARS to be rewritten as a clarified document.
You can find the document here.
It will be effective for compilations of pro forma info dated on or after May 1, 2017.
Charles Hall has a superb recap of the document at his blog, CPA-Scribo: Are You Up to Speed on the New Pro Forma Information Standards? If you want to get up to speed really fast, check out his article.