Looks like a new Withings Go budget fitness tracker will soon the light of the day with a fresh design and sensors. This became apparent from a listing on the FCC with the model number WAM03 that follows the model number of the original Withings Go (WAM02).
An accompanying diagram indicated that the new Withings could have a new rectangular look as against the circular design of the predecessor. The name Pulse HR also popped up indicating that a heart rate monitor maybe in the picture. In 2015, the original Withings Go was launched.
It was a basic fitness tracking device which could be clipped to your clothes or worn on the wrist. It had an E Ink display and sleep monitoring mechanism. The Go is not listed on its website, so it looks like the Go 2 may be launched by the end of 2018, or at least by early 2019.