I don't see necro happening with WD already, Druid actually makes sense. They could go for something kinda new/different and have transformations from Druid rolled in the new class too, kinda similar to how the original classes were designed. Like it doesn't have to be werewolf/bear.
And yeah the bounty timer change is great, it also feels they increased the range on the first detection so it points you in the right direction faster, don't waste time doing bounties.
The bounty grind, I don't think it's that bad, you get a bunch of bloodshards at the end(like 100 on T1?) and you get 6materials even on T1(8 on T7+) so you can get the extracting fairly quickly, for the rerolling it's another story but rerolling is really for the high end stuff and mostly it'll be for your weapon as I don't think spending 45mins-1hour to reroll a piece of armor twice is worth it. I think it's more like you grind the normal way, and once you're ready to push GRs and shit, you grind bounties for a while to reroll whatever you're missing, rather than try to reroll ancient everything at once.
Gems is the same? Actually, a bit better than before cause you don't have to do trials and shit, so you can just spam GR40 or whatever to level your gems as much as you can.