For those who missed it, a new update release GRASS GIS 7.4.4 is available since the 4th of January. It mainly brings bugfixes, but it also includes an important new function, the module r.mapcalc.simple. This module is especially important for a better integration with QGIS. It therefore has already been dubbed the “QGIS friendship” release :).
For more information, see the detailed announcement on https://trac.osgeo.org/grass/wiki/Release/7.4.4-News. For an overview of the new features in the 7.4 release series see New Features in GRASS GIS 7.4.