2 way data-binding is still in Angular2, as well as oneWay Binding to the input and one way binding from output. I've heard others make the claim ng-model and 2 way binding are gone, which is wrong. https://egghead.io/lessons/angular-2-using-ng-model-for-two-...

There are giant performance benefits on the horizon with Angular2 in terms of server side rendering with Angular Universal and state management with ngrx/store.

In Angular2 http is handled as an observable, no longer a promise, so there is a difference in syntax but that falls in line with ES7 format

The two way binding works by automatically updating, but also allowing you to hook into the outputs through a template convention (if bound via [(foo)], one can define a fooChange handler to hook into updates).