The calendar is going to be replaced by Timely, the next generation version (more feature-rich then the current one) Bigtop will replace the GMail interface.
Modern clusters use a new fabric type called Jupiter, built with the Trident+ chips made by Broadcom, that can grow up to ten times bigger then the old Watchtower clusters (up to 150k servers per fabric)
Old racks have been replaced by the Ikea enclosures that provide DC at the rack level.
The new machines are also really powerful in terms of cpu power and I/O (flash storage, 20Gbit network) and are significantly faster then the previous generation. The public pictures presented in the past are of really old designs that are not longer in service.
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The calendar is going to be replaced by Timely, the next generation version (more feature-rich then the current one) Bigtop will replace the GMail interface.