I may be going through that soon...just dont know when.
Your situation is a bummer, dude. But you mentioned "something sketchy was going on all week." Could you tell us more about some of those sketchy things that were going on? In this economy, your story may be repeated and perhaps there are lessons to be learned here.
As far as your boss is concerned, perhaps he has had a bad experience in the past with "retribution" from discharged employees and he thought he could circumvent the problem with the element of surprise. Still, you would think he would confide in his managers concerning the plans.
Be sure you file for unemployment while looking for a new job. Your former boss will have to pay for it, but he does owe you and the other employees something for the apparent suddenness of actions.
Good luck in your quest for a new job.
... but he does owe you and the other employees something for the apparent suddenness of actions.