Some details sound very encouraging:
"Alongside thick foliage, Sony promises a huge variety in environmental hazards, citing mountainous peaks, flowing rivers, volcanic clouds, lava and - of course - mud. In fact, the game will feature 16 multi-route tracks in total.
Sony has officially silenced rumour mouths too, revealing that monster trucks are a definite addition to the vehicle roster, offering an excessively muscular new challenge for players looking to crush their way through the field - and over opponents. Speaking of which, MotorStorm 2 will indeed feature a four-player split-screen mode, alongside online play for up to 16 players."