Binwalk version 2.0 is currently under development. This is a fundamental re-design which makes binwalk more modular and easier to extend.
Scripting is easier, plugins are easier – basically everything is easier.
New features, plus Python3 support (and possibly even a Windows package) are also in the works.
The only down side is that the 2.0 release will break backwards compatibility with the 1.x API. Ultimately this is a good thing as the 1.x API has gotten messy, but initially changes such as these are always painful for those relying on the older API, and for that I apologize.
Once 2.0 is stable enough to be merged into the master branch, the wiki and documentation will begin to be updated to reflect the new API.