https://www.hearthstonetopdecks.com/hearthstone-31-4-patch-notes/
Not a bad review in general, I guess, I’d recommend it re the miniset value etc.
Here I’m gonna quote something particular from it, although the point isn’t new:
Twist Update – A “new” Twist season launches in February by adding Un’goro to the mix, just like it was last time during Wonders seasons. After that, the Twist will “be on hiatus” again with more info coming in the future… Yeah. If that’s not a sign they gave up on it then I don’t know what is.
Well, I suppose… Besides, lemme underline: the mysterious February season that they promised has turned out to be the same as the previous iteration. Who would have thought… 
Another point from the patch notes:
Event Hero skins not earned through the event will be available in the in-game Shop after the event ends.
If I were to hazard a guess, judging by previous experience, they might be available for ‘rune$tone$’ only — watch out.
A few other points which I’ve personally found interesting, I’ll leave them here for further reference:
What else… Name changes for some cards — sounds interesting, if memory serves, it hasn’t happened for a long time… since some infamous and controversial updates like that [1], [2].
[1] https://hearthstone.wiki.gg/wiki/Patch_14.6.0.31761#Card_Art_Updates
[2] https://hearthstone.wiki.gg/wiki/Card_changes#Patch_14.6.0.31761_(2019-07-01)
Loaner decks — no details yet.