No other details were mentioned, leaving it unclear as to if that date applies to everyone or just those that pre-order. However, a listing from retailer game.co.uk notes "[the Xbox 360] demo will be exclusive to preorder customers up until 3rd November." nope
Valve previously said those who pre-ordered from "participating retailers or Steam" would snag "advanced access to the demo," with the company later adding that pre-ordering folk would also receive an exclusive melee weapon: the American baseball bat.
The PC and Xbox 360 game is due November 17. We're checking in for more details, including whether or not PC and Xbox 360 will get the demo on the same day.