I've been playing on 3.5 for the past few weeks now, and the system is actually fairly straightforward.
Essentially what you're looking at is
No, I mean, really, why do people ever ask these questions? Do you actually expect time travelers to show up to answer them? Devs just lurking and waiting to explain all the fancy new elements ahead of release? It's not live yet, so how do you expect anyone to be able to tell you anything? The whole point of new content is that it's new. Everybody gets to learn at the same time.