This update was meant for a small number of Betas and we made it available for a short window, did not account for the Argus eyed few here.It's just binaries, there are no config files or kinda to look at. The binaries are indeed different, but I cannot say what exactly they changed or added.
No, I check their Amazon S3 bucket regularly. They created a new dir and replaced AudezePenroseFW.xml file (Audeze HQ app just fetches this link https://audeze-penrose.s3.amazonaws.com/AudezePenroseFW.xml).
We do not plan to release this version as it is only a partial set of what we planned but hope to release a version in the next couple of weeks. The main change in the above version is the Mic quality there were other changes that I cannot post here yet, so contact support for details.