Web UI Framework Bootstrap has announced version 4 and released an alpha version. This is a major update that accepts more modern web techniques and drops support for old browsers.
Web Essentials, the extension introduced to add better CSS support to Visual Studio, has recently been updated with new tools for Visual Studio 2012, including support for TypeScript. It also includes automatic downloads of new schema files, so that HTML5 and CSS validation will always be up to date.
Web Workbench, the extension that brings Sass, LESS, and Coffeescript to Visual Studio, has been updated. This release adds support for Visual Studio 11, improvements to the import process and collapsible outlining for CoffeeScript.