While not immediately related to Galatians there is a new journal put out by McMaster, Biblical and Ancient Greek Linguistics. You can check it out here: http://bagl.org/volume1. Two articles have been posted so far and one relates to the πίστιϛ Χριστοῦ debate.
Cirafesi, Wally V. “ἔχειν πίστιν in Hellenistic Greek and its Contribution to the πίστιϛ Χριστοῦ Debate.” Biblical and Ancient Greek Linguistics. 1 (2012): 5-37.
This follows on the heals of his co-authored article of last year in which Cirafesi and Gerald W. Peterman examined Hippolytus’s use of πίστιϛ in response to an earlier article by Bird and Whitenton. The details are below. Specifically he looks at the implications with regard to Mark 11:22 and James 2:1 in addition to Hippolytus’s De Antichristo 61:26.
Cirafesi, Wally V. and Gerald W. Peterman. “Πίστις and Christ in Hippolytus’s De Christo et Antichristo: A Response to Michael F. Bird and Michael R. Whitenton.” New Testament Studies. 57:4 (2011): 594-603.