Go has been on a different development journey over the past 8 years, and the new logo is designed to convey Go's values and philosophy to users.
The new logo follows the brand's core philosophy of simplicity and sophistication. A sans serif typeface using modern italics is combined with three simple lines of motion to create a mark that resembles two wheels in rapid motion, expressing speed and efficiency. The circular shape of the letters alludes to Go gopher's eyes, a familiar shape that makes the mark and mascot a good pairing.
In addition to the new logo, Go has developed new brand guidelines and demo themes that establish the Go project's mission.
From: blog.golang.org