There's a rumor floating around that he'll be back in the next Mechaike special on 10/9, but then Tokyo Sports isn't exactly the most reliable source of information. Some say that Yamamoto is returning, which I personally think is completely out of the question.
Nakajima (the producer) even mentioned in his twitter that he's never shed that many tears this year as he did during the shooting of the special, which I'm hoping is a sign that Okamura is indeed coming back totally neglecting this whole "new member audition" thing.