AlphaOmega: If the company does not allow distributing their SDK files publicly then adding an OpenIGTLink translation server would make a lot of sense. This is useful for operating system and general interface abstraction as well (so you can switch between different devices or versions without impacting the software application). Plus toolkit makes implementation of such a translation server quite easy - it has been used for interfacing Slicer with many similar data acquisition devices. There are several examples of using proprietary SDK (Medtronic, Intuitive, etc.): you can put your own C++ source code in the public Plus toolkit repository and when you configure the project you provide the path of the proprietary SDK to CMake.
LeadOR, StereotacticPlan, WarpDrive: If there is no build error it makes sense to add these to the build, even if they are still work in progress. It allows you to distribute the modules to users to get early feedback.
WarpDrive: This module could be useful for a wide audience. It would be nice if you could create a short tutorial (bullet-point list, slides, or screencast) so that we can give it a try.
It would be useful if you could create a short youtube video of what these modules can do; just to give an idea to people who did not attend the hangout to know what this extension is about.