The most praise I've heard is that It's going to have all of BNW's mechanics (trading/religion ect), has any other revolutionary things been announced?
unstacking the cities is the major one, new engine supposedly built from the ground up with modding in mind, changes in ai, changes in diplomacy, civics is a new research tree and social policies have been completely reworked, active research allowing you to boost research by accomplishing tasks, change in how great people work to some kind of global market??, amongst other things, yeah, a lot is different
on the civ youtube channel they have videos trying to go over the new stuff, including some streams of them just playing the game for a while with commentary about specific features