As per IGN...
Battle of the Bands - Apr. 21 - $49.99

Battle of the Bands is the first time a musical mashup game has been delivered on Wii, allowing players to battle it out with their preferred musical style. The game features both an exciting two player versus mode and an extensive single-player campaign where players take on the role of one of eleven bands trying to topple the nefarious big boss Mr. Hong and take control of the faraway city of New Cadenza.
Battle of the Bands introduces the innovative concept of music switching, putting the player winning the battle in control of the style of music both players hear. When an opponent turns the tide of battle, the music changes as well, switching between different music styles. Battle of the Bands features 30 classic and modern chart-topping hits from over the last four decades, all of which have been recorded in five different styles - (rock, funk/hip-hop, country, Latin and marching band) - for the game, resulting in a total of 150 unique, playable recordings.
Heavenly Guardian - Apr. 22 - No price

The Snow Goddess Sayuki will battle ghosts, monsters and evil demons to gather the necessary ingredients to create a cure for her beloved, a common boy in the town village. Though their union is forbidden, she will traverse all of ancient Japan to save the one she loves!
Heavenly Guardian embodies the fast-paced fun and adventure of a classic arcade shooter while utilizing the powers of the Wii to add new thrills to the genre. Journey through various environments and fight through a variety of mythological creatures! Fight the journey solo or gain the aid of your companions in cooperative two-player action. Search for power-ups and special items to vanquish the evil gods and save your love from death.
Target: Terror - Apr. 22 - $39.99

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Wild Earth: African Safari - Apr. 22 - $39.99

Wild Earth: African Safari puts players in the role of a photo journalist sent on an adventure through Africa's Serengeti National Park to photograph and chronicle 30 different exotic animals, from elephants and hyenas to rhinos. Players will wander the African territory and take pictures in order to put together "informative magazine-quality pictorials." Nabbing the best photo will have to be balanced against drawing too close to the animals.
Based on the PC game Wild Earth, the Wii game includes exclusive new features such as a three-player cooperative mode and a Safari mini-game in which gamers can play the animals' perspective using intuitive gestures via the Wii remote. Talking Drum Records has additionally provided an atmoshpheric soundtrack for the console game.