Re: Animal Crossing
There's at least a few new mechanics according to the video: swimming, hanging stuff on your wall, NPCs following you around, and a "vertical" shoreline as opposed to only horizontal. Not much to go on right now, no. I still personally maintain that Animal Crossing could be a great candidate for user-generated content to be shared online. Not just patterns and so forth, but
everything. People should design furniture, program mini-games for certain things (pool table comes to mind), maybe be given a way to develop small games to play with other users (sort of like how people will make unofficial games within the context of the world's existing ruleset), etc. They should also beef up some of the options in general for the game - no expression restrictions, quicker way to cycle through most-used-items, etc.
Re: Luigi's Mansion 2: Another reminder from me that

yes. My only fear is that multiple mansions were mentioned, so I hope this doesn't mean the game is now on a level-by-level structure, since I enjoyed the somewhat claustrophobic exploration the original embodies.
Rolling Western looks interesting, but the environments seem a little sparse. Seems like it has action and defense tower elements. Really looking forward to hearing about it more.
Picture Lives (or whatever its called) looks hilarious. Need more information.
Mario Kart is Mario Kart. Seems like you can customize your vehicle this time around though. Maybe they are trying to work in more strategic layers into the game - these tires go faster, maybe you can get a part to protect you from one red shell per lap, etc.
Kid Icarus looks great, wish it were already here.
And Super Mario looks amazing. Absolutely amazing.
Excellent stuff.