Hi Mike,
I'd say it's worth holding off for 2 or 3 weeks - there are still a few bits of API that are changing / under discussion. I've done some updates to the lifecycle approach and mediatorMap, which still need to be reviewed, and I know Shaun is rejigging some core stuff.
We'll be happy to help you with this when you do get started - I just know that we're in a really dynamic spot where a few key things should get settled one way or the other pretty soon - as we've thrashed out all the alternatives.
Cheers,
Stray