Google to Hold Oct. 4 Event to Unveil New Smartphones, Hardware - Bloomberg

Also see Google confirms October 4th event—prepare for Pixel phones (Ars Technica)

"Google sent invitations for an event in San Francisco on Oct. 4 where the web company is expected to introduce new smartphones and home-automation hardware, along with other new product upgrades.
The text of the letter, which includes the phrase "Ok Google, add to calendar," suggests a bigger role for the Google Now voice assistant. The invitation also features an animated graphic showing a search bar that morphs into the shape of a smartphone."

Google to Hold Oct. 4 Event to Unveil New Smartphones, Hardware - Bloomberg