From Swirlvision:
Sega has revealed the Japanese release dates for two of their highly anticipated Sonic games. Sonic Adventure DX: Director’s Cut for Gamecube will see release on June 19th for 6,8000 Yen. Sonic Pinball Party for Gameboy Advance will see relase on July 17th for 4,800 Yen.
The U.S. release dates for both games will be around the same time frame.
Source: Swirlvision