as far as I know its gonna be 52 episodes coving the whole manga and it'll be split into 2 cours
Thriller Bark
AL.
Zolo
By the pace , Im not sure how 52 episodes will be enough... they can only skip raijuta arc and start shishio arc now with Saito returning. But still each arc is around 100 chapters long. So they will have to cut something. Or 52 episodes will only cover shishio arc