Twitter released with typeahead a new auto-complete component. It has more features than the old bootstrap-typeahead.js and less bugs (f.ex. in the Bootstrap version the first entry will get always selected - annoying).

Some examples of Twitters Typeahead: http://twitter.github.io/typeahead.js/examples/

Unfortunately it isn't very easy to add Twitters typeahead component to a Twitter Bootstrap project, because there are CSS collisions. It would be cool if Bootstrap 3 would ship with the Twitter Bootstrap component or make it more easy to add it as a separate component.