Fridge? I have an external HDD. Was quite cool to see the Wii U automatically choose where to download games to, Warriors Orochi 3 went to the internal memory (and clogged it up completely), Pikmin 3 automatically went onto the HDD.

Am I making too much out of the fact that the Club Nintendo intend-to-purchase surveys have different expiration dates for the digital and retail versions? Could Nintendo bump up the digital release date as a surprise or am I looking too much into it?

31 MB seems like a lot, especially compared to the original. To put it in perspective, that's almost four times as much memory as the GameCube largest first party memory card. I wonder what changed. Miiverse?

Did the camera in wind waker store in the save file?

I like when people notice things like that. My guess it's that they have a different marketing strategy for the 2 types. It could be that they are trying to gauge how many physical copies they need to make so if you're going to buy digital they want to know quickly? It's a great question.

My 2TB HDD says I'll never have to clean out the fridge even though I buy all Wii U games digitally!

that would imply that the sound in the game is being reworked somehow.

There's no implying needed Nintendo did rework it