On one hand, the gameplay doesn't usually change so drastically that a new version matters too much.
On the other, if they did dramatically change up the gameplay it might suck.
So even though they have a decent track record and I love Civilization, I would never pre-order or buy day 1. I'll wait and see if it's actually worth getting. I will also say, in my experience, like 90% of games that used Denovu have not been good in the first place. I can name only 1 I thought was worth its cost, and I only got it after they removed the DRM (Lies of P).
Judging from the gameplay reveals it seems that they changed some pretty fundamental stuff that makes CIV, CIV.
So it will be interesting to see what it's like.