Hi,
yes, and also be aware this is not just for PlayMaker, we are talking about everything not text based... Animator, Avatar, Curves, Scenes ( Unity collab seems to want to diff scenes, but as we saw, their system is not yet ready and they don't seem like having an answer to it until end of next year), materials, any prefabs, etc etc.
Bottom line, your best approach is to comment thouroughly, commit often, very often ( I even commit several times for a single feature commiting it bits by bits to cut down on even smaller feature, so that's it's clear what's happening, what's new, etc etc).
Bye,
Jean