Lifted this from the 2kgames blog:
During a recent livestream I asked Civ fans to send me some specific questions for the development team at Firaxis. You guys delivered!
Please keep sending me your questions, you may find them featured on the blog along with an answer from Firaxis.
-Kate
www.twitter.com/Ga1Friday
Q: What is the strength value of one of the unrevealed units?
A: 34. But it might change.
Q: Is one of the not yet revealed civs from Europe?
A: Do you mean Europe, the Eurasian landmass, or culturally European but located elsewhere? But seriously, the answer is yes. We have a European Civ coming still.
Q: What is the star thing on Biology we saw on the other live stream?
A: The star means that the tech allows you to establish an additional international trade route.
Q: What is the name of a Unique Ability found in the next civ you want to reveal?
A: Sorry, we cant reveal that. However a snippet of the text string describing the Unique Ability can be shared. That is:
for each International Trade Route with
Q: In which era do the new Aesthetics and Exploration policy trees become available?
A: Aesthetics is a Classical Era SP. Exploration comes online in the Medieval Era.