Looks to me like someone slipped him a copy of our Alignment Golf Drills Video. Everybody talks about his Left Foot and Knee, but what struck me was his Right Foot Action. On the swings I saw, it is totally different.
Sure looks like his hip action is very improved as a result. Much, much more stable base for his pivot.
Also looked like he had been reading 5 Lessons re: the left hand grip. It is much more stable, under the heel pad.
Now if he would just take his grip at impact fix with a solid right forearm flying wedge
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"Support the On Plane Swinging Force in Balance"
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Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2