The number of times they made substantial changes for the live update in comparison to its ptr counterpart is rare and few. As many others have said, the live patch notes rarely differ from it’s ptr patch notes (besides a few number differences here and there). Also their focus usually changes for each ptrs, so feedback that’s given in a previous ptr is rarely used in the next. Otherwise, Monks would have damage reduction in their sets, Crusaders would have decent or better Phalanx builds, Barbarians would get more love for non-ww and non-frenzy builds, and the list goes on.
This patch for example seemed particularly focused on getting wizards to use energy twister, hydras, and arcane orb, and while a few of the changes have some interesting interactions, most of the changes ask for a wonky interaction and was done at the cost of several existing builds. Frankly speaking, if there are no changes done in this ptr patch, then I highly doubt we’ll see any changes in the next few patches that pertain to the contents of this patch (besides some additional damage boosts here and there), as their focus will likely switch to another class (this may be especially true if the contents of future patches are of the same size as this one), who I hope get better changes than what wizards got in this patch.