The itemization ideas they have I think are solid. They want to reign the set bonuses in so they're not the defacto choice at end game, but still want legendary powers to be good, interesting and not simple stat tweaks.
The thing they're doing I'm not happy with is the return to skill points and talent trees. This feels like a way to go back to D2 just to appease that fanbase when I think the D3 system is *vastly* superior.
D3 encourages ability exploration, especially as you level up, unlock runes and get new legendaries that might encourage some abilities over other one. The thing for me with runes is not only are the effects highly noticeable, they also change the audio/visual appearance of the ability in game. The talent tree? Won't do this. I have a build of lightning spells. So...I will have 5 abilities on my bar, which means I will dump my skill points into those five abilities. (IE: Not an interesting choice to make) I will then pick all the talents that buff lightning damage, and maybe a few that dictate playstyle. IE: I'm using a close range spell as a primary damage dealer, I'll grab the talent that does more damage in close range.
The talents aren't interesting since they have to be generalized across all abilities. They also can't change the visuals of abilities at all for the same reason, so we get that watered down list of buffs with skill points that don't offer that many meaningful choices all to get things to feel more like D2....which is a vastly inferior system to D3, and I'll say it, even Path of Exile. Having a shitload of potential choices isn't interesting. I like having the choices smaller, but give them actual impact.
Anyway, that's my big concern. Also I have concerns about them dialing back legendary drops. I agree at high levels of torment it's insane, but I think the normal drop rate playing the game without any torment modifiers it's pretty fair. I feel like I get enough legendaries on a normal 1-70 levelling trip to keep it interesting. I think they need some kind of escalation since at end game you're likely trying to find specific pieces, so they either need some way to ramp up drop rates, or a way to target drops.