At first i was a little disappointed that i wasn't getting super mario galaxy 3. then i thought about it, watched some gameplay videos of the title, and now i think that super mario 3d world will be a solid entry of the mario franchise.
Personally I loved 3d land, and from the looks of it 3d world will be a longer, more fleshed out version of what 3d land already proved to be fun.
The addition of multiplayer, as well as character specific perks, as well as new hats are all added bonuses i'm looking forward to.