Elmofongo: did not follow the game much, but so far does it have substantial difference from Torchlight 1 or just minor additions like new classes?
They have extra classes. But the game world is a lot larger than before. One big thing is that you spend far more time outside in a real world between quests. They've also updated the inventory system and mod tools.
I played the online test version and it looks like it's going to be a bargain for people even if they have no interest in multiplayer.
One thing I'm interested in is that you can take a character that's played through the entire game and start over with the same character, all the loot and skills transferred.
So yes, basically it has the same feel, but it's a much larger game and there should be a good set of mods available before too long if the game itself isn't varied enough.