The video above has a segment, beginning about time 4:55 to 5:25, that may be of particular interest to the Coast Guard. It appears that the Navy may finally be moving from the 25mm gun to the 30mm in their next iteration of the Mk38 mount.
We have known all along that the 30mm is more effective for Coast Guard type missions. Apparently the Mk38 mod2 was adaptable enough to except the 30mm but the Navy did not seem interested. Despite earlier indications the Mk38 mod 3 would be significantly different, including use of the 30mm, when it immerged, it retained the 25mm.
I suspect the combination of the UAS threat and the availability of a programable air burst round may be what has gotten the Navy’s attention.
For our purposes, in addition to the air burst round, the 30mm does have a greater selection of projectile type including “swimmer round” designed specifically to counter Fast Inshore Attack Craft (FIAC).