Well, there are some news, but you won't be happy to hear them. Work for Armada has been set aside. Antoine is curently working on and playtesting different expansion: Babel. It should be released in 2014. It's information I was able to decipher from Antoine's twitter account!
7 Wonders is my all time favorite board game, so I'll wait patiently for any expansion I can get. That said, does any one know WHY Antione decided not to move forward with Armada? My understanding was that it was pretty much finished.