Hi,
Yeah, I think support will be provided, via the wiki, I haven't heard of any official support for PlayMaker. I think it will be like Photon probably.
Before I ( If I am the one to first have a go at this) do it, I'll wait for the 1.x release to be out, as always, 1.0 release are always subject to lots of changes and bug fixing. Currently, I strongly recommand using existing solution, they are battle tested and provides proper support. If you start using the Unity network solution, you'll be relying on the usual Unity support, forum and UA, which could be problematic at time. If you rely on an addon, you can expect ( I would hope), a strong dedicated support.
So, I personally will wait a bit, see how much it will cost, what are the options, etc etc, and also see what kind of samples are coming out with it, which is very important for providing PlayMaker port that is useful.
Bye,
Jean