Reikan has released FoCal 1.6.0 with the following improvements:
Through Feb 24th, get Reikan FoCal Automatic AF Microadjustment Calibrator Utility v1.2 at a special new-release price.
Reikan's Facebook page talks about a minor FoCal update to v1.2.1 (Plus version only).
This is a helpful Reikan FoCal discussion. (thanks Scott)