Thanks to the sources cited below we won't have to wait for the Made by Google event on Tuesday, October 15th for details on the 4th generation Pixel phones. I believe the only unknown at this point is their price.

Here are the leaks that have broken in the last 24 hours:

Official Press Renders

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Black

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White

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"Oh, so Orange"

Specs

Pixel 4:
5.7 inch full HD+ smooth OLED display (up to 90Hz), ambient EQ
Snapdragon 855 processor with Pixel Neural Core™
6 GB RAM / 64 or 128 GB storage
12 MP dual-pixel and 16 MP telephoto rear cameras
2800 mAh battery
Stereo speakers
Titan M security module
Face unlock, motion sense
Android Q with 3 years of security and OS updates

Pixel 4 XL:
6.3 inch quad HD+ smooth OLED display (up to 90Hz) – ambient EQ
Snapdragon 855 processor with Pixel Neural Core™
6 GB RAM / 64 or 128 GB storage
12 MP dual-pixel and 16 MP telephoto rear cameras
3700 mAh battery
Stereo speakers
Titan M security module
Face unlock, motion sense
Android Q with 3 years of security and OS updates

What's in the box:
Pixel phone (obviously)
1 metre USB-C to USB-C cable
18 watt USB-C power adapter
Quick switch adapter (female USB-A to male USB-C)
SIM tool
Quick start guide

Sources: 9to5Google, Android Police, Mobile Syrup