In May 2018, the U.S. Marine Corps will begin receiving the CSASS, also to replace the M110. There has been some small-scale testing of the CSASS since then but no news of widespread fielding or adoption.
The U.S. Marine Corps is set to begin receiving the CSASS in May 2018, replacing the M110.  Limited testing has occurred since then, but there hasn't been any news about widespread implementation or adoption.