The Forward Global Calibration Method (FGCM) performs global photometric survey calibration with forward modeling of the atmosphere and instrument, including chromatic corrections (see http://adsabs.harvard.edu/abs/2018AJ....155...41B for the paper describing the method).
DM-14670 is complete, the stack will be able to run the full FGCM calibration on (at least) HSC data, with outputs fully compatible with stack products produced by (e.g.) jointcal. FGCM has been successfully run on HSC PDR1 data ( DM-14669) and is also being run on HSC S18a data ( DM-15545). The only limitation for running on other cameras is the requirement that transmission files be available ( DM-12366).
In order to bring this fully into the stack, the FGCM (pure python) third-party package (https://github.com/erykoff/fgcm) will have to be added to the stack (via a github fork to allow easy continued development), and the fgcmcal package currently hosted by lsst-dm (https://github.com/lsst-dm/fgcmcal) will have to be moved to lsst_distrib. There are no additional dependencies that will have to be added that are not already in lsst_distrib.