I have created this thread because I want to know how, when and if indeed Max is coming back. I figured someone might know or have some speculation
speculate away 
I predict he will come back at halloween. First episode features camera shots from his POV peering out of the bushes at Ian Beale, Jane Beale, Phil and Stacey. Second episode sees Ian Beale turn to a customer at the chip shop saying "next". Customer lowers hood to reveal himself as Max and says "A portion of chips, please."
speculate away 
I predict he will come back at halloween. First episode features camera shots from his POV peering out of the bushes at Ian Beale, Jane Beale, Phil and Stacey. Second episode sees Ian Beale turn to a customer at the chip shop saying "next". Customer lowers hood to reveal himself as Max and says "A portion of chips, please."
Holding Sue Tully's hand by any chance?