Include the mobile support in MVC 4 (I know the roadmap isnt a plan - and this could be put off)
I am about to begin building a mobile site for some of my customers - and this would be SUPER helpful.
in ASP.NET MVC 4 we added the Mobile template. You can also learn more about adding mobile support in asp.net on http://www.asp.net/mobile
MVC 4 Beta has mobile support. See my tutorial http://www.asp.net/mvc/tutorials/mvc-4/aspnet-mvc-4-mobile-features