*VS2012 allows designing and building UIs with Blend
VS2012 RTM has Blend which can be used to build Windows 8 App using:
1. HTML  project type for JavaScript
2. XAML project type supporting code development using C#, VB or C++
VB provides more project options with Blend to create Windows 8 apps.
Designing screens for Window 8 apps is a breeze with Blend support

*Lightswitch is part of VS2012. You can create both HTML5 and Silverlight based apps
  LightSwitch+HTML5 works with any browser.

*Use OData protocol to feed Lightswitch application

For example: You can access the famous Northwind from a ODATA endpoint at
http://services.odata.org/Northwind/Northwind.svc
With any of the authentication methods.

* Ability to create multiple Solution Explorer windows and move them on to connected monitors.

*IDE has grown so much, there is even a search feature to search the IDE for objects

Follow Jeff Cogswell's article + Slide from which this post is generated here:
http://www.eweek.com/developer/slideshows/visual-studio-2012-rtm-comes-chock-full-of-enhancements/