Bootstrap 3 is now Mobile First

Bootstrap 3 a complete rewrite of the docs, CSS, and JavaScript.  Here are some of the major improvements:

• Mobile First Design
• Responsive CSS is no longer separate and all responsive features are now compiled into the core bootstrap.css file
• Horizontal forms are now mobile-first, meaning at <768px, elements are stacked. Above that, elements are floated and appear side-by-side
• Refactor responsive-utilities.less to account for new mobile-first approach
• Dropping IE7 and FF3.6 support, combining standard and responsive CSS into a single file, and consolidating additional code as appropriate.
• Docs templates are built with Jekyll instead of Mustache
• LESS changes 
• Rename variables to use dashes instead of camelCase
• Replace existing color variables, e.g., @blue, with symantic, e.g., @brand-primary
• Remove .border-radius() mixins
• Change name of clearfix mixin
• Mixin itself is now .clear_float() and class is .clearfix
• .opacity() mixin now uses decimal values instead of whole numbers
• Simplify Layout and grid system (single grid system again)
• Form controls are now 100% width by default, input groups have been overhauled, and form states simplified.
• Font icons! Converted to Glyphicons v1.7 @font-face, dropping the old PNGs
• Differentiated the labels and badges 
• badges no longer have modifier classes and are purely meant as unread counters.
• Jumbotron (formerly hero-unit)
• improved styling for mobile viewports
• Navbar improvements
• Keeping .navbar-for, dropping .navbar-search form layout
• Overhaul styles of default navbar
• Update active state of nav links for mobile view
• Lots of overrides, extra styles, and more
• Redesign the modals to be mobile-first
• No longer require use of .hide

• Drop the .thumbnails meta component.
• Redesigned Carosel
• Redesinged Customizer (highlight depenencies)
• Updated Makefile to reflect the changes to the docs build process (namely Jekyll)

Note that gradients and other embellishments have temporarily been removed, which produces a flat look and feel.

Get Bootstrap 3 Now

You can go here to check out the release candidate: http://rc.getbootstrap.com/

-- or -- just download it directly here:  https://github.com/twitter/bootstrap/archive/3.0.0-wip.zip

References

https://news.ycombinator.com/item?id=5351632

http://jekyllrb.com/

http://expo.getbootstrap.com/

https://github.com/twitter/bootstrap/pull/6342

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