Some big news was released by Robert Kirkman at NYCC, as he announced that there will be a FearTWD and The Walking Dead crossover, where one character will go from one show to the other show in 2018.

“I’ll say this: There are two Walking Dead shows. There is one character that I will not name that will appear in the other show that I will not name. More news coming in the following months.”
-Robert Kirkman on potential Fear TWD crossovers with TWD
Sources: @TheWalkingDead on Twitter and @TheWalkingDead on Twitter confirms a crossover next year here.