I've said this before, but it needed its own thread; I really hope that TMI will contain a lot of night-life ambiance. I think that dark moonlit settings really set the tone for the MI universe.
My favorite island was Melee (and to a lesser extent, the first island in MI2), due in large part to the brooding and creepy-yet-peaceful nighttime setting. That, combined with the bustling populace, the mysterious "brewing conspiracy", and the occasional surprise scripted event, really provided a sense that something was going on! It felt alive somehow, and gave MI a deeper meaning beyond just the funny jokes.
By comparison, CMI took longer for me to warm up to because it was lighter and more Disney-like in tone. And subsequently, EMI felt like a shallow vehicle for a series of goofy one-liners. Although EMI did re-visit Melee, for some reason my lingering impression is that the overall tone of EMI was charmless, arid, and desert-like. I'm not worried about the TTG designers getting it wrong -- I just hope they don't forget the importance of setting the darkish MI tone.
Am I crazy, or does anyone else get where I'm going with this?