Update: It's live.
Last night, we revealed a project codenamed Bigtop that Google has been working on for a few years. And now, I feel confident enough to announce that it's launching later today as 'Inbox by Google' (not to be confused with Inbox).
According to multiple sources, the service, which has been in development since 2012, is going to be invite-only at launch, just like Gmail was, and will at first target Gmail users.
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