It will soon be time for a new release of the DAZ Importer and MHX Runtime Systems. But recently a number of related add-ons were spawned from the importer add-on, cf the post on Add-on Split. There has also been some progress on the BVH Retargeter, which can now also deal with FBX files, see FBX Files and BVH Retargeter. The plan is to release all of them together in the near future.
Since the last release was version 1.7.3, the original plan was to call the new release 1.7.4. However, the BVH Retargeter is already at version 2.2 (version 2.0 was when the name changed from MakeWalk), so going back to 1.7.4 would be confusing. Therefore, I decided to change the version number of all add-ons to 4.1.0.
Making such a jump in version number is unusual, but it is not that different from DAZ going from Genesis 3 to Genesis 8. And of course the new version number carries another piece of information: 4.1.0 is the most recent version of Blender that the add-ons have been tested with. Even if the Diffeo add-ons are by now quite mature and I don't expect to add much new functionality (but you never know), there will probably be updates since new Blender versions always tend to break something.