Considering that many current civs can create ponies and military instantly, it makes sense that sacrificing peons from collecting resources to dance, would result in instant production.
Of course, ES may limit which units benefit from the rapid production bonuses.
AOEIII does have trade-offs for most things, so I would expect ES to try and create a balance, to keep some of these bonuses from getting out of hand.
Then the actual community will help balance the expansion, just like it has happened with the initial AOEIII.
"The devil and the priest can't exist if one goes away, its just like the battle of the sun and moon, night and day. The force of the devil is what we are told to fear. Watch out for religion when he gets too near."
"Living in a world of fantasy, I can hide behind what's real."
"Behind a smile, there's danger and a promise to be told, you'll never get old. Life's fantasy, to be locked away and still to think you're free! So live for today, tomorrow never comes. Die young."