We are currently working on the 64-bits support, so you won't find that problem by February .
However, it doesn't explain setting on the facebook, gamecentre, google play game services side of things. I'm sure that can be googled though.
We have some articles regarding some of these topics. We want to add more, as plenty of users are asking this kind of information. Meanwhile, you might find interesting this one: http://support.ludei.com/hc/en-us/articles/201489185-Step-by-step-guide-Facebook-SDK-for-CocoonJS
It is explain how to use our JS Plugins, but C2 plugin uses the same process in the inside for all the Social Services, so you can just skip that part.
Apart from that, we are finishing testing the new release, but we found some minor bugs we are fixing right now. I will keep you all inform, but I would like to ask you a little bit of patience. Sorry for any inconvenience, we don't want you to wait neither.