Microsoft has announced another new build, this time just a (very) minor refresh for those of us on the 19H2 Release Preview Ring, bringing the build number up to 18363.387. According to the updated blog post, "This is just a small refresh update from Build 18363.385 with some fixes for uninstalling 19H2 updates."
Microsoft released the same small update for 19H1 Release Preview Insiders, who are on a 18362 build track, and promised a 19H2 (build 18363.xx) version soon, and here it is. Might as well go through the motions and test this one if it applies, we've come this far :).
One good thing about these minor builds is that we should be getting very close to a full release of 19H2. Then it's on to whatever there is still left to test of 20H1 and beyond.