Nikon introduces the Nikon D300s as an upgrade to the sucessfull mid-level DSLR D300. The main differences:

• 720p HD video with autofocus while recording (a major improvement)
• socket for external microphone
• quiet drive mode (a long awaited feature!)
• improved continuous shooting (7fps vs. 6fps)
• Live View and Info buttons
• own ‘OK’ button in multi controller
• virtual horizon
• SD card slot in addition to existing CF slot (probably a concession to upgraders)

All in all, not a major upgrade but a good one!