I just learned of this special issue in Psychological Methods. I am looking forward to reading many of the articles as the idea of "big data" analysis in psychology is important. I am particularly looking forward to reading the article co-authored by Jack McArdle on SEM trees. I am not sure I will understand it, but I know Jack does tremendous work. He was the first person to introduce me to SEM methods many years ago (during the WJ-R project; he taught me SEM, very gently, with a program called COSAN..and then I graduated to LISREL), and he was an awesome teacher---he could make complex stat methods conceptually clear. I also then learned of decision-tree methods (CART, MAR) from Jack, and believe they should be used more in psychological research. This PM issue should be well received by the quantoid readers of this blog.
Update -- Psychological Methods - Volume 21, Issue 4