Pokemon Rumble U will be arriving in Japan on April 24th.
In addition the game will be the first Wii U game that will utilize NFC. Below you can see the definition of NFC:
NFC, short for Near Field Communication, is a short range wireless RFID technology that makes use of interacting electromagnetic radio fields instead of the typical direct radio transmissions used by technologies such as Bluetooth. It is meant for applications where a physical touch, or close to it, is required in order to maintain security. NFC is planned for use in mobile phones for, among other things, payment, in conjunction with an electronic wallet, and for setting up connections between Bluetooth devices (rendering the current manual Bluetooth pairing process obsolete). The technology is promoted by the NFC-Forum.
The game is known in Japan as Pokemon Scramble U.