(J)Wt 4.12.2 is a bigger patch release that fixes a couple of issues, and also introduces some improvements. Check the release notes for more info.
The main points of attention are:
some improvements for bot handling
several fixes to layouts
several fixes to the models and views
Here are the links:
Wt 4.12.2 (C++): download wt-4.12.2.tar.gz (release notes)
JWt 4.12.2 (Java): download jwt-4.12.2-rc1.zip (release notes)
Binary builds for Windows are available on the GitHub releases page.