I am very exited about this. For anyone that has not played the original game you can download the game and it's English patch here. I highly recommend that you read the manual before playing.
But as for the WiiWare version you can find information on it here. They are modifying many aspects out of the WiiWare version such as removing anything related to the MSX, taking away crude puzzles and graphics such as The Woman Statue, and significantly lowering the difficulty compared to the original game. I understand all of these changes but am a little disappointed about the difficulty, but the La-Mulana team has created something for those who had mastered to original game. You can read the statement on difficulty here. But I still imagine that it will quiet hard, so beware of temper tampering.