There is a total of six new boards and over 80 new mini-games, some that can be played with the Nintendo Mic, a microphone that lets players speak their way to victory in certain minigames! (mariopartylegacy.com)
The new Perspective Mode allowed players to play certain minigames up close and with a new camera angle, and the Museum offered an interesting shop and relaxing feel to look at the different unlockables you've collected. (mariopartylegacy.com)
While the characters do vary a little in abilities, with some being better at certain minigames than others, the game won't actually tell you these differences anywhere. (hardcoregaming101.net)