Okay, so NSMB Wii is out. That's turned into a discussion about how it could've been better and/or what should be done differently next time.
Let's direct our speculation thinking caps over to Galaxy 2 since it's coming out in the first quarter of the new year.... wait, in the summer of the new year... no wait, probably holiday 2010.
Let's address release date: Nintendo mentioned long before NSMB Wii that Galaxy 2 was right in the pre-going gold stage and basically ready, but they didn't want to release two big Mario games around the same time for fear that there wouldn't be enough hype to go around for each game. I believe the source was IGN (or maybe it was Iwata Asks... not sure). Now, IGN reports that Nintendo has no friggin' clue when they wanna release Galaxy 2 with a horribly vague "TBA 2010" to look forward to.
Knowing Nintendo, "TBA 2010" probably means Galaxy 2 will be shown at E3 2010 as a 5 minute playable demo with the recent trailer playing in the background, and then they'll back it up to late November so they'll have enough copies to go around for the Christmas rush (and I guess keep it consistent with Galaxy 1's November release date).
Knowing some TMKers, "Well, a rushed game is never a good game" will probably be the general response to the aforementioned paragraphs.
Another thing: Since Nintendo knows that NSMB Wii is a huge success even though they probably knew they had the power to make the game a lot better, do you think that Nintendo is kinda "testing the waters" thinking: "Hmm, if we made NSMB Wii a slightly above-average game and people are eating up, how many corners do you think we would be able to cut with Galaxy 2 to make it decent enough to where millions will buy the game, but we can save quite a bit of money on it?"