Recent rumors round the mill speculate that the next version of Android, i.e. Android 2.3 aka Gingerbread, will be out on the 11th of November. That is to say, the SDK will debut on the 11th of November.
The big fuel to this fire was supposed to be the unveiling of the Nexus Two at Samsung's event in New York City yesterday, but since the Continuum was released instead, it's questionable whether Gingerbread will also be out on time. However, both Google and Android campuses have Gingerbread men on their lawns and this certainly has to be an indication that the sweet dough is coming soon.