That's according to Ubisoft:

Monster 4x4: Stunt Racer puts Wii-lovers back into the driver's seat for a whole new race. Gamers of all ages will enjoy even bigger wheels, faster trucks and crazier stunts which made Monster 4X4: World Circuit the second highest selling driving game on the Wii ever.

Whether you're grinding through inner-city construction sites, crunching out-of-town canyons, or scraping through exclusive wall-driving features, players will be able to perform vertical stunts and find shortcuts as they take on their friends and family in 4-player split-screen modes.

"Monster 4x4: Stunt Racer is a game the fans of Monster Truck World Circuit have been restlessly waiting for,” said Tony Key, senior vice president of sales and marketing at Ubisoft. "Players will get to experience more excitement, upgraded features and the exhilarating action of steering the world's most powerful trucks while tearing through new extreme off-road racing circuits.”

There are some screenshots here: http://www.worthplaying.com/article.php?sid=65666

Look at the bullshots compared to the actual gameplay ones hahah

yup, vgchartz agrees too. Granted there is an absolutely massive difference between 1 and 2, and 3 is only like 10k away but technically it's #2.

i loved the original one on PS2, i didn't know this was released. it looks different.

which one?

World Circuit was an early Wii game, but there's a sequel coming (my bad for not being clear in the OP!)

Monster 4X4 Stunt Racer key features:

• NEW STUNTS: Players can use nitro to pull off crazy stunts like barrel rolls and back flips. Drive up vertical walls to reach shortcuts, avoid difficult terrain and cross the finish line right before your friends.
• NEW TRACKS: Monster 4x4: Stunt Racer takes players through 7 new tracks ranging from inner-city construction sites to out-of-town canyons. Each track will provide a new driving experience. The various terrains will have different effects on the truck. Avoid mud pools and patches of ice or risk losing control.
• ALTERNATE ROUTES: Players can navigate their way through levels by choosing between different routes that vary in difficulty. Decide between scoring points to gain nitro and taking the racing line to make up time. This includes 50 different challenges across 10 ranks and over 30 side missions.
• PLAY WITH FRIENDS AND FAMILY: Have fun playing with friends and family with up to 4 players on split-screen in a variety of multiplayer games including Racing, Freestyle Show-Off and Last Man Standing.
• INTUITIVE CONTROLS: Easy, wheel-friendly handling gives full and intuitive control over your truck as you push it to the limit.
• NEW UPGRADABLE VEHICLES: Whether it's a European Super Car or a powerful American SUV, Monster 4x4: Stunt Racer has a vehicle to match individual driving styles. Every vehicle part (spoiler, tires, engine…) can be upgraded, giving an extra edge during the race. This includes 6 fully upgradable vehicles and 5 un-lockable supercars.

Monster 4x4: Stunt Racer is scheduled for release in Fall 2009.

it also released on Gamecube too and looked different from this one