I share the concern of others about this possibly feeling a little light in content, but for me its primarily regarding the roster. I really hope once you beat the story you unlock a bunch of characters that don't make sense to be included. I'm not expecting it to match the original version after all the DLC, that'd be ridiculous, but I do hope it includes more characters than it currently seems it will (and I imagine it will). Give me multiple Links and Zeldas even, go crazy with it. Zelda was one of my favorites in the first game.
I'm also looking forward to the hopeful return of Adventure Mode. Man, that was great.
If they have another Adventure Mode, I think that's we're the pure fan service will come in. They won't be tied to canon and will likely do whatever. If they do DLC (I mean why wouldn't they), they can celebrate Zelda 35 with it.