Sonic Unleashed - PS2, PS3, XBOX360, Wii

Sonic Unleashed is the next in the Sonic the Hedgehog series being released late 2008. European date will be added once confirmed.

Dr. Eggman is the primary antagonist for Sonic Unleashed. In this installment, he has called forth a slumbering beast from the center of the Earth, which causes such devastating tremors that the planet shatters into pieces; it is up to Sonic to return the seven broken continents back to normal by retrieving the Chaos Emeralds and activating their power. The official press release alludes to a new twist to Sonic's abilities; unofficial screenshots, together with the official teaser trailer, indicate that Sonic's progress will be made even more difficult when he transforms into a werewolf at night.
Gameplay will primarily consist of two modes: a 3D-modelled sidescroller, with two-dimensional gameplay (as found in the Sonic Rush and Sonic Rivals series), with seamless shifts to 3D. Concepts returning from past games include Sonic's trademark high-speed gameplay, as well as improved lock-on for automatically targeting and hitting enemies. Sliding across the ground also returns, but players will be able to perform new "side-step maneuvers", allowing Sonic to dodge obstacles to the left or right at high speed. Another new control mechanic, whose final implementation is still being decided upon by Sega, is "drift turns", whereby Sonic can slide around a corner.
An on-screen energy meter can be filled by collecting rings, which is used to activate a temporary speed boost, during which time the camera uses a fish-eye effect and motion blur; hitting enemies and obstacles will reduce the meter.
Two stages and associated gameplay have been demonstrated to journalists, and shown to the public in screenshots; these two have been dubbed "Europe" and "Greece" by the publisher. A day and night system for levels will also be introduced.

More info at: http://en.wikipedia.org/wiki/Sonic_Unleashed