Rainbow Six Vegas is already available for the Xbox 360, but the PS3, PSP and PC versions aren't yet ready to go. Ubisoft has officially announced they won't hit their expected ship date, and only the PC version will make it for this year.
The PS3 version, initially expected to be among the launch titles on November 17, is now expected to release on January 30. The PSP version, originally planned to release in early December, is also set for a January 30 release.
However, if you've got a good gaming PC and need your Rainbow Six fix before 2007, you can pick up a copy on December 12; Ubisoft delayed the release only a couple of weeks past the previously expected date of November 28.
For the time being, the company hasn't provided the reasons behind each delay.