CForm and CActiveForm (and validation) in 2.0

Hi, just wondering if there are any planned changes for CActiveForm and CForm in 2.0? I understand that there are plans to rewrite yiiActiveForm.js to make it easier to reuse, but apart from this will there be any major changes to the way forms work? Especially form builder? The reason I ask is I’m planning to write a validation and forms layer on top of Backbone.js which will use the forms and validation rule definitions from my Yii forms and models. But I don’t want to put too much effort into this if form builder and the way validation rules work are going to change dramatically in 2.0.