This release brings variables and parameters to conditional GCode, other minor improvements and bug fixes. See https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-Beta-&-RC#reprapfirmware-33beta2 for important upgrade notes and the change list.
The IAP files are included here but have not changed since 3.3beta1. For WiFi-enabled boards, DuetWiFiServer 1.25 remains compatible with this release.