Add LESS compilation/support
Add ability to create LESS files and have them served as CSS, and integrate with the minification coming in 4. Syntax & Auto-Complete would be big pluses as well.
Full LESS editor support with Intellisense and validation is coming in Web Tools 2012.2 RTM. The compiler will not be included in that release, but there are 3rd party extensions that can compile LESS
David De Sloovere commented
The Web Essentials 2012 extensions has this, build by Mads Kristensen (works at Microsoft)
(and this is more something for the visualstudio.uservoice.com part)
Cool feature, but it has nothing to do with MVC.
This is already possible with a Visual Studio Extension / Add-in.