If you are using Web Deployment projects, like I know some of you are, there is an update that you may want to download. The latest version is now Beta b2 Preview. The only change that I have really notices is that it supports the new Web Application Project type. I am not sure if it fixes the debug web project issue where it insists on validating everything when you just want to debug the application. You can get it at the link below.
Web Deployment Project Update