I wanted to get plenty of Game time in before giving any feedback so I waited until now.
I think you guys are well on your way to a success. The addition of the "Books" means even if you reload a map you have played before, it will always be a different game. New Books = New Skills = new Abilities= New Playstyles (at least for some). I really like this addition.
The return of the "Above ground" minerals we saw back in A16 is a sign that what was once tested and worked, is used in the future.
Not too crazy about the reversal of the "Food" system where the canned food is now the basis