Sega just put out a release list of their upcoming European titles. Check it out below.
15th: Sonic Riders* (PS2, NGC)
15th: Shadow the Hedgehog* (PS2, NGC)
15th: Spartan: Total Warrior* (NGC)
Wii Launch: Super Monkey Ball: Banana Blitz (Wii)
Unknown or in 2007:
February 2007 Charlotte’s Web (GBA, NDS)
Spring 2007 Sonic and the Secret Rings (Wii)