Is it just me or there are actually icons in FontAwesome 3.x.x that are missing from FontAwesome 4.0.0? If so, this definitely makes FontAwesome much less awesome for me...
--EDITED--
Michal Rybak is actually spot on. You should submit that as an answer. The icon looks exactly the same. Can't believe I missed that.
Though I'd like to point out, in the FA site it says, if you know what it looks like you know the class name in 4.0, It think it looks like a cross, or X. I would have never guessed "times"
--ORIGINAL--
I came here looking for fa-remove as well! That's disappointing. Now it looks like I have to revert back to a previous version after having migrated 2/3rd of my app to the new version.
To answer your point about documentation: The old version can be accessed here:
http://fontawesome.io/3.2.1/
I found the link while browsing through their site and stumbled upon their notice about no IE7 compatibility.
This definitely needs to be linked (atleast) in the footer