Call me an Optimist, Sir_Schwick, but I am hopeful that this might mark a move AWAY from the vast empty plains of the past 3 civ games. The important wording that was used is 19 playable civs. Now, I might be reading too much into this, but I hope that it means that other civs will be represented as Minor Civs-bringing them up from their current status as mere goody huts and barbarian encampments.
Like I said, though, this might just be wishful thinking on my part.
As for ages, I actually think this was a GREAT addition-though it should be a little more flexible, and should be based on more than merely the tech tree (i.e., you should need to have a certain level of cultural, social and/or economic development first).
Yours,
Aussie_Lurker.