Jason Stellman, longtime critic of the Federal Vision, and the man who brought charges against TE Peter Leithart, has announced that he is leaving the PCA. The reason for his leaving revolves around his changing theology, specifically in regard to Sola Fide and Sola Scriptura, both of which he no longer holds.
You can read his own words on his blog here: http://www.creedcodecult.com/2012/06/heartfelt-farewell-to-pca.html.