No confirmation on this, but a quick look at Big Jonesy's tweets suggests that Walt is having some second thoughts on attempting a return next year [all spelling errors are original]:
Now wronder in it worst it go come back to what. I think some time you came push your body to the point of no return and you have to face reality.
I think I have had a great run at this thing the NFL and seahawks and the fans hve been great to me.
There is no easy way to give something that you have been doing for s long time.
There's no announcement, but I think it sounds very clear that he's thinking about giving up the game. Now, he's kind of joked around about this on Twitter before, but not quite this explicitly. What are your thoughts?