With module-init-tools being declared a dead project by its current maintainer, a new project has stepped up to take its place: kmod. This is intended to be a drop-in replacement, though deprecated functionality in module-init-tools has not been reimplemented.
If, upon upgrade, pacman moves
/etc/modprobe.d/modprobe.conf to a .pacsave, you should move it back. This file, and any other config read by module-init-tools, is still read by kmod. However, the kmod package will no longer include a blank config file. You'll find the same (if not more) documentation in the manpages and --help output for the binaries.