As of today, the Python 3.5 and 3.6 builds produced by the buildbot are compiled with VS 2015 and include assimp:
panda3d.org/download.php?pl … =devel&sdk
Be sure to grab a build for Python 3.5 or 3.6, since the regular Python 2.7 build does not include assimp support at this time.
Let me know if you run into any issues.