Mistwalkers are going to use mana, not chi.

I'm also wondering if the roll move is limited to windwalkers and brewmasters or if mistweavers can use the roll, as well. Because, as far as I know, it takes energy, right? So, how does that work, since mistweavers use mana? Do we still get a roll move or is that just more for the other two specs?

In serpent stance, abilities that normally cost energy cost mana instead.

And just to clarify (or muddy, if it comes out wrong) the waters; any of the monk abilities that are usable both in and out of mistweaver have both an energy cost and a mana cost. You use whichever of the two resources you currently have.

As a random sidenote, does the inclusion of the Jade Lightning spell combined with stances for three of the four guardian animal spirits kind of sort of imply that there's a Red Crane stance associated with a fourth Monk tree that is all evocative of Lo Pan's lieutenants from Big Trouble in Little Chine? I know that it isn't in right now, nor planned to be, and I'm certainly not saying it's something needed. But it does seem like something where there's the space to do it.