We've been seeing reports since late August about a new version of the Home Mini smart speaker, and what 9to5Google has been reporting is then is the arrival of the Nest Mini. It'll arrive alongside the launch of the new Pixel 4 and the Pixelbook Go on October 15th. It'll reportedly have better sound with more prominent bass. The small smart speaker will supposedly have a 3.5mm audio jack to help pin against the Amazon Echo Dot.
A recent look into the APK of the Google Home app shows that the speaker will indeed be called the Nest Mini and that it might have what Google calls "Ultrasound sensing." This feature was first seen in the Nest Hub Max, where an ultrasound sensor will automatically display controls when you approach the smart display. The Google Home app's code shows that this feature can possibly support other devices other than the Nest Hub Max.