I haven’t been able to find an abstract for this article but JBL is widely available so have a look.
Lappenga, Benjamin J. “Misdirected Emulation and Paradoxical Zeal: Paul’s Redefinition of ‘The Good’ as Object of ζῆλος in Galatians 4:12-20. Journal of Biblical Literature. 131:4 (2012): 775-796.
Nijay Gupta has informed us that the latest issue of Journal for the Study of Paul and His Letters (2:2) has a Galatians theme! Unfortunately there doesn’t seem to be a way to access it electronically which means I’m out of luck. Here is the list of articles:
“Salvation History in Galatians and the Making of a Pauline Discourse” (Bruce Longenecker)
“The Nature of Salvation History in Galatians” (Jason Maston)
“Salvation History in Galatians?” (response to both above by M.C. de Boer)
” ‘It Has Been Brought to Completion’: Lev 19:18 as Christological Witness in Gal 5:14″ (Michael Suh)
” ‘Once Upon a Time’: Galatians as an Apocalyptic Story” (Todd Still)
“Davidic Messiahship in Galatians” (Joel Willitts)
“The Messiah ben Abraham in Galatians: A Response to Joel Willitts” (Matthew Novenson)
“Dissertation Summary” (Stephen Carlson)
Two Reviews on Recent Galatians Commentaries
Paul's Epistle to the Galatians 