Facts:
1) None of the "normal" Bungie employees showed up.
2) Finally a cleaning woman showed up.

This leads my twisted mind to imagine 4 theories:

Boring theory. Evil theory. Truly evil theory. Truly boring theory.

Boring theory.
That no Bungie employee shows up is because they dont want to be catched on film so..

a) They deftly bypass the camera.
b) That door is not the personell entrance
c) That's a closet.

Noone told the cleaning lady. (about the camera etc)

Evil theory.
While Bungie shipped 300,000 copies of Myth, they sold very few, and as normal, their distributor did not pay them. Because of this Bungie has...

a) bankrupted
b) been bought by another company
c) been dragged away in captivity to Rhiad'Mond to make programs for Balor Gates.

The cleaning lady has done the final cleaning of the former Bungie headquarters. There will be no "Microwave simulator", no "Blam", no "Myth II".
Still noone told the cleaning lady.

Truly evil theory.
The Bungie personell has spread out across the globe in preparation of of their imminent takeover of the world. Remember the countdown on the Codex? Well if you had Jeff Goldblume and a powerbook you would be able to see a more accurate countdown transmitted from the Bungie comet ship.
The cleaning is the last cleaning before Bungie moves to Bungie Imperial Headquarters of the World.

Of course noone told the cleaning lady.
"What's this? "Plan to take over the world"? Oh, those boys"

Truly boring theory.
As everyone should have guessed no true bungie employee shows up before 11 am, and I was checking too early.

And the cleaning lady knows more than I think.