There are quite a lot of new releases coming this month, although some in the list are Japan-exclusive. I highly doubt you'll want to play Hana Hana anyway - it's a full-price slot machine simulator. Fun!
Some of the dates have been taken from the official Sega Europe site, and others from this excellent unofficial list on the Sega of America Boards.
- Altered Beast (Mega Drive/XBLA) - June 10th
- Comix Zone (Mega Drive/XBLA) - June 10th
- Gunstar Heroes (Mega Drive/XBLA) - June 10th
- Phantasy Star II (Mega Drive/XBLA) - June 10th
- Shinobi (Arcade/XBLA) - June 10th
- Sonic 3 (Mega Drive/XBLA) - June 10th
- Gunstar Heroes (Mega Drive/PSN) - June 11th
- Infinite Space (DS) - June 11th
- Let's Tap (Wii) - June 19th
- Virtua Tennis 2009 (Wii, PC) - June 19th
- Extreme Racing: Pure (PS3) - June 25th
- Hana Hana Dorasurotto Da Festival!! (PSP) - June 25th
- Memories Off: Afterrain Edition (PSP) - June 25th
- The Conduit (Wii) - June 26th
- Sonic Unleashed (Mobile) - June 2009
In other news, Make a Pro Baseball Team! 2, which was released last month in Japan on the DS, has debuted at #2 in the Enterbrain Chart. It sold 46,586 copies in its first week.