I've played the new version. Apparently people who had an account have access to a head start.
Actually, from what I've seen (which is just the first area) most enemies go down in 3-4 hits and the actually attack speed of the player is much faster (or rather the global cooldown is much shorter).
I haven't played anything besides blood magic, fist, shotgun, and hammer, but of those four, three are "build resource, then do something with it." From what I've seen of shotgun (which isn't much because shotgun felt extremely boring to me, so I rerolled after taking it) there is no resource building, just ammo selection every time you run out of shells.
Hammer, blood magic, and claws, on the other hand, do have the resource building part.
Hammer builds up its resource by hitting things or by being hit and spend it all on one hit once their resource is full.
Claws build up their resource by then go into either a damaging or healing state for a few seconds where all of their abilities are replaced by the frenzy state's abilities.
Blood magic builds resources into its two directions (very similar to elementalist from what I've heard) so each healing ability you use pushes you down one direction and every damaging ability pushes you down the opposite direction. The farther you are from the center, you more your abilities damage/heal, but using abilities start taking a percentage of your max HP with each use (also, your healing input is reduced). There are some abilities that will reset you to center when used and will do something extra if it's a certain distance from the center, so in essence a resource spender.
On a somewhat related note, the ability trees are dumbed down quite a bit. There are three ability branches and 5 passive branches. Between each passive you can unlock, there is a permanent stat increase, so in order to get the most out of your character, you will unlock every weapon type for the stat increases. Of course, AP and SP are gained much slower now, so the grind remains, BUT DON'T WORRY GOY, BECAUSE YOU CAN BUY AP AND SP WITH REAL WORLD MONEY! Also, in order to get access to the other weapon trees, you need to spend AP.
On an unrelated note, the quests follow a set path now. Before there would be side quests that would lead you from quest hub to quest hub, but you didn't need to do them in any particular order. Now, you need to do them in a particular order. For example, you cannot get the quests at the church or from the fortune teller until you finish the first quest from the old lady.
Crafting is now about leveling your weapons. So, you sacrifice weapons to level up your current weapons. Of course, doing this requires you to spend a certain currency. This currency can be gained through quests or by finding lore blocks (or whatever they were called) or you can purchase this currency with real world money like a good goy.
As for a concern I had before playing, no, this is not a new game. The story is (in essence) the exact same. It honestly looks like they just redid the textures and other assets, but the dialog and cutscene animations are the exact same (including the terrible lipsyncing).