Metal Allegiance, the metal supergroup featuring core members David Ellefson (Megadeth), Alex Skolnick (Testament) and Mike Portnoy (The Winery Dogs, ex-Dream Theater), along with multiple special guests, have announced a Anaheim, CA show. The concert will take place January 25, at the House Of Blues, and confirmed guests include: Bobby Blitz (Overkill), Andreas Kisser (Sepultura), Chuck Billy…