Since Laravel 4 is Composer based, these have been extracted away. There are ports of the old HTML and Form helpers from Laravel 3, as well as a new package built with Laravel 4 support in mind. See this for more details:
https://github.com/jasonlewis/jasonlewis.me/blob/master/arti...
Still, shouldn't they decide on some kind of default? (Even if it's third party). What will happen to laravel bundles if everyone uses different form libraries in those bundles? (I assume there will still be something different from composer for bundles?)
Well considering bundles have been dropped in favor of packages it shouldn't really matter. There should never be any conflicts because packages should be namespaced in a vendor/package fashion, meaning one package can use Form helper A and another can use Form helper B without conflicting.