Evidently, only the RWD models that have Autopilot hardware got the performance upgrade. My 2014 MS85 was one of the earlier models with autopilot (delivered late november last year) and the "increased performance" section does appear in the final release notes. It's the first thing I looked for!
However, it's not exactly night and day. The "throttle" curve has been adjusted so it feels more responsive at low speeds, but when you drop the hammer 0-30 feels no different ("d" models still have the advantage). However it's noticeably quicker once you get to 30mph and higher, so 30-60 feels a bit "snappier." Slightly more highway oomph too, but again nothing drastic, overall a slight increase. Probably .1 or .2 quicker from 0-60. My butt dyno says the performance of S85 with 7.0 is on par with a P85 once you get over 40mph.
I did a "before" video of a 0-60 run last week, and in the next few days I'm going to go to the same stretch of road for the "after" run to see what the difference is.