Where are the reanimated four hokages? The Hokages have been reanimated by orochimaru. but i didn't see the jutsu being released. did i miss something? where are the reanimated hokages now?
Rikudou Sennin or The Sage of Six Paths released the edo tensei or reanimation justsu cast upon them by orochimaru. 
There was an emotional scene between Naruto and Minato , the fourth hokage.
where the release is evident. Watch episode 474 and 475 .