Okay, this can be considered SPOILER material for some, all that it really is though, is a name. Nothing in the way of plot spoiling or anything. It’s a rumor circulating right now. This is the first thing we’ve heard about The Matrix 3 specifically.
A rumour came swirling out of the production today that one of the major single villains in the third film is someone called ‘Quintessence’ to be played by a kung fu expert.
(Update, January 22, 2012: Possibly later renamed as Seraph?)