Does typeahead support a remote data source in version 2.0.3 of twitter-bootstrap?
Typehead function reference http://twitter.github.com/bootstrap/javascript.html#typeahead
Have you tried:
$('.typeahead').typeahead({ source: function (query, typeahead) { return $.post('/typeahead', { query: query }, function (data) { return typeahead.process(data); }); } });