Theming System like VBulletin? CSS Files in the database, along with all the themes information. It would definantly be my favorite feature when this comes out.
And then, a new intergration system, which allows you to use the user system of a forum system of your choice(optional). Also uses the smilies of the forum system. I have seen an interesting CMS that does this(ocportal.com) I personally only like it because of this handy feature.
New Theming System & Advanced Intergration System 
Linear Mode
