The primary purpose of this update to release 3.2beta3 is to address communication issues with an attached single board computer and an issue with keeping PanelDue up to date. However, it also includes a new heater tuning algorithm and feedforward heater control. See https://github.com/Duet3D/RepRapFirmware/blob/v3-dev/WHATS_NEW_RRF3.md for the release notes and https://forum.duet3d.com/topic/19761/new-heater-tuning-algorithm for an overview of the feedforward heater control.
The main firmware binaries for all Duet main and expansion/tool boards have been updated in this release. DuetWebControl, DuetWiFiServer and the Duet 3 Mini IAP file have not changed since release 3.2beta3.
As usual, users of Duet 3 + RPI or other SBC can get this update form the unstable package feed. Other users should use the files here.