WOO HOO!!!! LOS ANGELES, April 11 (Reuters) - Microsoft Corp. (MSFT.O: Quote, Profile, Research) on Monday said it would unveil the next generation of its Xbox video game console in a May 12 special on cable music and entertainment channel MTV. The unveiling will be a first, as video game companies usually take the wraps off their new consoles at the industry trade show E3 -- which will be held the following week in Los Angeles