If there are going to be tweaks to UAs of current Civs for the expansion, I doubt it's going to be very extensive and it's not going to be all about religion and espionage. I think we should be vigilant for placing too much emphasis on this aspect of the game. They're not going to take Spain, Ottomans, Iroquois, Aztecs, Arabia etc. etc. and change their UAs to all have some religious focus to them. And then also add Ethiopia, Israel, Khazars, Tibet etc. etc. and give them all religious UAs as well. At least, I would find that very unusual.
Yes religion is going to add depth to the game, and yes there may be one or two tweaks to 1 or 2 civs with regard to religion, but they can't just very well go and change lots of civs so that they're all geared towards religion in one way or another. Again, that would detract from other aspects of the game which have to remain just as important.
Just saying...lets not get carried away