Credit goes to Nintendo Everything here. They received information about possible features that will be included in Mario Kart 7.
- Download Play support
- Local/online matches
- Create custom communities with specific parameters
- Share communities with others
- Can’t electively turn on/off whatever item you choose and adjust their frequency
- Start with one long list of different items, characters, kart paths
- Then choose one of these as a specification
- Can have a green shell only race or a Luigi only race or a standard kart frame race
- Can’t specify more than one option at a time (making matches such as a no Blue Shell, mushroom wheel race impossible)
- Balloon Battle: pop as many opponent balloons as possible within the time limit
- How many balloons you lose has little impact
- Coins Battles are timed as well
- Collect as many coins as possible while hitting your opponents’ vehicles to get them to lose their coins
- Six Battle Mode courses: Battle Course 1 from Mario Kart Super Circuit, Big Donut from Mario Kart 64 and Palm Shore from Mario Kart DS, Honeybee Hive, Sherbet Rink and WuHu Town as well
- Mirror Flip races and other community settings included
- Mirror Flip flips the course you’re racing on
The one that stands out is the item adjustment. If you can adjust the frequency of items in gameplay, that instantly makes the game competitively viable; players will be able to eliminate the over-powering items and leave what can't do much damage (bananas, basic shells, mushrooms). It's almost guaranteed most of the online players will go for no blue shells, although there probably will be some that will make it blue shells only.
In any case, this is great news for the game. It is possible to have custom tournaments.