Personally, I'm happy to hear that the changes between Dark Souls and Dark Souls II are significant and that it's not just a "straight sequel."
Going from Demon's Souls to Dark Souls involved a lot of "horizontal" changes like the Metroidvania/open-world game structure, Estus, humanity system, covenants, stat revisions, and shift in tone/setting, in addition to "vertical" changes like increasing the number of bosses, size of the game, and amount of equipment/spells/armor.
Sounds like Dark Souls II is going in a similar direction, with even more attention being paid to fine-tuning and revamping existing game mechanics as well as improving fundamentals like framerate, game balance, and multiplayer connectivity. There are still potential pitfalls, of course, but I think it's good that they're not content to stay in one place and continue to explore new ideas.
This is the way features should overlap in a series with multiple entries, with ABCD being the core (thematic) elements and everything else being subject to change.