As of April 15 2014 the GLASS observations of the cluster MACS1423.8+2404 have been completed, i.e., 14 orbits split between imaging in F105W and F140W and grism spectroscopy in G102 and G141 as well as 14 orbits of imaging in F814W and grism spectroscopy in G800L.
Hence, the observations of 2 out of the 10 GLASS clusters are complete… and counting.