It was already confirmed earlier that there would be more killstreaks after the AC-130, but who would have thought that the last killstreak is a tactical nuke? After getting a killstreak of 25, you can use it and kill everyone, including you, for an instant win.
If you haven't guessed, Call of Duty Modern Warfare 2 is already being sold in some stores (for a premium price), even though the official release date is still 9 days away. The Xbox 360 version of MW2 has also leaked to the internet.
Thanks to the leaked videos, which Activision keeps removing, the following pages have been updated with the latest information: