I haven't watched anime since 2012.
What have I missed?
What ever you do, do not listen to any of the hype around Re:Zero.
The most note worthy things to come out it that time would be Attack on Titan, One Punch Man, Fate/Stay Night UBW, Hunter x Hunter (Although that started in 2012 I think), and well I could keep on going but what ever.
My favourite anime since 2012 would be Ping Pong The Animation and Haikyuu.
>not Attack on TItan
Shinmai Maou no Testament
Watch for Chisato and Zest. Cross Ange is also really funny.
Unless you were watching toward the end of 2012:
>I'll take "What franchise would I bet the house that they will never adapt over the next four years, and even if they do, they'll destroy it beyond recognition?"
Attack on Titan, Kill la Kill, Sword Art Online S2, Yuru Yuri S3, Jojo's Bizarre Adventure: Stardust Crusaders, Fate/stay night: UBW, Log Horizon.
KyoAni hasn't done anything worth of notice ever since you left. Shaft is still adapting more and more Monogatarishit. Literally nothing else except for the usual seasonal SOL shit.