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The building will also have 300,000 square feet of research facilities, and the auditorium where press and analysts come for announcements will be "totally underground". This could be partly due to security, but it does sound ominous -- keeping press literally in the dark, as Apple has done many times before.
But the space alone will ensure that major product and service announcements -- even major events like WWDC -- will be hosted on site and not at other event areas as seen before. Apple's current campus is small compared to these plans -- and the mass expansion to the larger office will allow for many hundreds more employees to be hired.