FYI  Stellar GA 4.0.1.44 release is now available on ALE BPWebSite since yesterday.
All modes are supported : Express, OV Enterprise & OV-Cirrus modes.

Direct software links on ALE BPWebiste:
https://businessportal.al-enterprise.com/awos-40144-release-omnivista-package
https://businessportal.al-enterprise.com/TDD000844

Supported Hardware:
Stellar Wifi 5 : AP1101, AP1201, AP1220 series, AP1230 series, AP1251, AP1251-RW-B, AP1201H, AP1201L, AP1201HL, AP1201BG
Stellar Wifi 6 : AP1320 series, AP1360 series

Find list of all features supported by the 4.0.1 & fixed issues, from maintenance build 4.0.0.3076, in attached Release note.

Features in all modes Express, OVE & OVC:
Out-of-Box MESH (auto-MESH)
AP Management VLAN Support
Security vulnerabilities
AP Background scanning enhancement
Support AP MU-MIMO mode enable/disable
Support AP 11ax mode enable/disable (Wifi 6 series only)
Support Beacon Interval Configuration
Support IGMP Snooping Configuration

Features in OVE & OVC modes only:
IPv6 Managed Infrastructure
Allow Reflexive Policies on AP
mDNS service network with policy control (except AP1101)
RAP-Support VLAN tag via GRE tunnel (except AP1101)
RAP-Support Local breakout (except AP1101)

Direct link on ALE BPWebiste for Stellar features in OVE & OVC modes:
https://businessportal.al-enterprise.com/TDD000837

Take also limitations & dependencies provided in Release notes, regards the following features :
Rogue AP detection,
Cluster preemption with AP13xx series,
Management VLAN,
IPv6,
Link aggregation,
RAP feature,
DPI handling,
DRM feature