From the best-selling Mortal Kombat® franchise, Mortal Kombat: Tournament Edition delivers exclusive videogame action to the Game Boy® Advance with multi-link play, more warriors and "karnage." Mortal Kombat: Tournament Edition features new bloodthirsty partnership opportunities that allow up to four players to battle head-to-head in tournaments, as well as wager in-game currency, which enables players to place bets on the outcome of linked battles, mini-games and other secret fighting challenges. Also added to the game are two forms of "currency" -- available in red (new and exclusive to Mortal Kombat: Tournament Edition) and gold -- to wager with combatants, unlock or purchase hidden characters, backgrounds and other features in the "krypt." Mortal Kombat: Tournament Edition is scheduled to ship for the Game Boy® Advance in summer 2003.
Just a clarification, this is an extension of MK:DA for the GBA and not a remake of any of the classic MK titles.
Update 2: Midway has a section for MK:TE on their website with more media.
Update 3: IGN now has the E3 reel from Midway's GBA lineup that inlucdes MK:TE.