Hope you don't mind for a second (and a third, while I'm here :P) question :)
Being so popular, one of the big plus of Angular is the great availability of documentations in various forms -- among that, books. What about Aurelia? Is there any project for a (or more then one) book? It seems I didn't find anything, even from publishers which usually supports "Beta" ebooks publishing (i.e. partial releases of a reduced set of chapters).
Also, it seems Angular 2 supports RxJS for functional programming; it's even included in their official quickstart application. What about Aurelia? By reading other replies it shouldn't be that hard to plug it in; am I wrong?