Tablets, phones, laptops. The new 3 promises to be mobile friendly from the start.

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One Fluid Grid

There is now just one percentage-based grid for Bootstrap 3. Customize for fixed widths.

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LESS is More

Improved support for mixins make the new Bootstrap 3 easier to customize.

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Responsive Design. It'll blow your mind.

In simple terms, a responsive web design figures out what resolution of device it's being served on. Flexible grids then size correctly to fit the screen.

Smaller Footprint. Lightweight.

The new Bootstrap 3 promises to be a smaller build. The separate Bootstrap base and responsive.css files have now been merged into one. There is no more fixed grid, only fluid.

And lastly, this one. Flatness.

A big design trend for 2013 is "flat" design. Gone are the days of excessive gradients and shadows. Designers are producing cleaner flat designs, and Bootstrap 3 takes advantage of this minimalist trend.