I’m gonna be keeping an eye on this. I’m a little sceptical right now what with them only showing 3 Heroes and 3 skills for each, some of which are pretty basic/standard for ARPGs/Hack-n-slashes. But it is early so I’ll just wait and see.
I do hope the loot isn’t lacking either and offers some variety as that’s another big complaint I remember reading from other players that played Torchlight 3 - every class only gets or ends up using 1 Legendary set that overshadows everything else and it’s filled with some relatively generic bonuses. Which in my humble opinion, sounds like a distant far cry to the breadth of options you could pull out of Torchlight 2.
The past day or 2, I was really thinking about 3/Infinite and what I believe I wanted/want or others that played Torchlight 1/2 want out of them and it really felt like it was more of what 2 did but bigger and more refined. The core aspects of 2 were awesome - varied areas with secrets and great enemies, plenty of skills to experiment with that augmented or changed with tier bonuses (though admittedly I wish more were fairly balanced), plenty of gear to spice things up even further with some even synergising directly with your skills. Even some of the smaller features like fishing and transforming your pet, while small and arguably unimportant/low on the priority list, were memorable.
When it boils down to it, that’s often what I feel ARPG/loot-based game players want with sequels. They want their game to keep the core gameplay elements that they love while experimenting on top of but not interfering with or removing any aforementioned core elements. Not gonna lie, I love some of Torchlight 3’s ideas like the Railmaster’s Train, the Steam Bot or Relics pushing crazy potential ideas like a Bloody Saw Bot or Poisonous Train if the player gets creative and weird enough, things that weren’t possible in the previous instalments. But the lower number of active skills, basic skill trees and as mentioned above basic loot turns me off from the notion of buying and playing it. Just how many well and truly unique Steam Bot character builds will I be able to make? How does this stack up to the number of different Berserkers or Embermages you can make? If I had to name a sequel that I personally feel really delivers in enhancing it’s gameplay over the previous instalment in recent years as a frame of reference/comparative POV, it’d be Borderlands 3.
That’s my 2 cents anyhow, just wanted to get all my thoughts out somewhere so I can stop thinking about all of it 
.