This should be multiple choice.
1. obviously improved AI... this is something I have waited for since I joined in A8... but I doubt they will fix all the issues... so this feature alone wouldnt make me "come back" to A17
2. Vehicles (NOT gyrocopter! I hope it doesnt make it into A17 -.-) bicicle and car... LOVE this! Finally beeing able to have a lategame vehicle with more storage and duo(quad) seat... awesome!
3. ragdolls! oh how i hated always KNOWING that a zombie wasn't dead... now... unless i get close to it (and see no "open inventory) I dont know if they actually died or if they will come after me if i turn around to face the other zombies!
4. world art! I love the new lighting and new trees and new pois that look spookier!
things I absolutly couldnt care less about:
world building. Questsystem is extremly basica nad barebones and the dungeons are completly irrelevant, since i can simply break everything in my way. Nice for roleplaying i guess... but nothing in here for me.
overhauled weapons. also looks very bare boned and unfinished... maybe aas soon as i play it, I change my mind and its awesome... right now... I feel like the old system was a bit better... (only 6 qualitys makes progression a lot more stale)
I have to wait and see:
everything else... not very excited... but not ancious and like that the game progresses.
*edit* well... already 2 worldbuilding fans... huh... never thought this sandbox would have many of u
I knew tfp's wanted to go more into a roleplaying direction... but I never thought anyone else wanted that... I stand corrected
(still nothing for me though

since im a "min/maxer"... I dislike to die and want to reach lategame to build awesome stuff to defend against the hordes!