A "chaotic, full-impact race" is available in the single player 8 Ball, which is held within the shadows of San Francisco's Golden Gate Bridge. There's also multiplayer Rampage.
Complete the 8 Ball race and the multiplayer mode of Rampage will become available, which is an 8-player demolition derby event with points awarded for "crashes, smashes and eliminations."
Those who download the DiRT Showdown demo will also get invited to join the RaceNet beta, a "free new online extension for Codemasters Racing games, which enables players to track their Races, Rivals and Rewards." It's full of stat-tracking and even community challenges, boast Codemasters.
"Gamers who join RaceNet will also be rewarded with an exclusive ‘RaceNet’ livery for use in the full game and will receive $20,000 in-game currency for DiRT Showdown when it races into retail on May 25th."
DiRT Showdown releases on Xbox 360, PS3 and PC May 25th in the US, 29th in EU.