Instead we will focus on bringing first class publishing support for Website projects. You can read more details at http://blogs.msdn.com/b/webdev/archive/2012/08/06/plans-regarding-website-projects-and-web-deployment-projects.aspx. In a nutshell, you will have all the same features that WDP has, but a lot more as well. Also another good thing about this is that we will have one experience for both Web App Project as well as Website Project. So when we make enhancements both project systems get it.
If you had any customizations in your WDP, you should be able to copy/paste those into the new web publish profiles (they are MSBuild as well). Take a look at the blog above and please do let me know if you have any concerns.