v2.0 is a ways off yet. It's defined more by a list of features than a date. (That is, when those features are ready, we'll call it v2.0.
) Routing to separate monitors is not easy to do cross-platform, unless Qt, the main library Mixxx is based on, offers something. We haven't yet looked into that since we have other things that are higher priority. But feel free to ask around the Qt community and post your findings on our wiki under a page called "Multiple monitor support" under the Features Discussion section of the main page.
Mixxx Developer - Controller Specialist
Mixxx Windows package maintainer