I get the impression that Google was making a point...
They could sell out a device with no pomp and circumstance simply by relying on the viral nature of the internet. A few well timed and coordinated leaks and it started a wildfire with rumors and speculation.
No renting out convention halls, expensive advertising, official teases, etc. They proved how powerful their brand is without having to do much at all. The community took every single rumor and ran with it. It is pure genius if you can get away with it.
Hype reached a fever pitch this morning and out of nowhere the flood gates were opened. What benefit would an announcement have made?
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