At the very least we'll be able to handle observables in the binding system with a plugin. Here's one that supports binding to the eventual value of Promises and Observables:
github.com/jdanyow/aurelia-computed/blob/master/R…
If adding capabilities via an optional plugin somehow limits our ability to integrate with observables we could look at adding support directly, but I doubt that will be necessary. In my experience Aurelia and ES7 Observables are compliment each other nicely.