Are we really descended from lung fish? An Australian study says perhaps:-
http://www.sciencedaily.com/releases/2011/10/111004180106.htm-Note the hind 'leg' pre-preparation.

There is a chatter-box gene, that may predate humans:

http://discovermagazine.com/2011/oct/08-the-brain-language-fossils-buried-in-your-cells