It is apparent to me that Tiger has been looking intently at film of his old swings, and for good reason: it was an awesome move. The good news here is that the new swing that he tweeted just a while ago (October of 2017) looks a lot like the old one (I side by side the new one with one from 2000). A couple of things look different: his hand path in 2000 was more out in front of him toward the ball while his new swing’s hand path is more descending from the top, and in 2000 his hips cleared a bit faster and finished more “in the box” with more retention of right lateral bend than now, although with his back issues it is not surprising that he is more vertical and less bent over in the finish. He must find a way to swing with power and not hurt himself, and it remains to be seen what effect his lingering back issues will have on his ball striking when and if he can consistently play competitively. Overall, I think this swing is a hopeful sign, and I am one among many that are rooting for him.