neowin[.]net/news/windows-11-24h2-is-now-available-for-final-testing-before-public-release/
This *might* be the closest we get to an RTM [Release To Manufacture] version -- earlier versions have already gone to manufacturers, considering new laptops etc. with Win11 24H2 are due to ship starting in June, while 24H2 won't officially be ready until September. [What could go wrong? ¯\_(ツ)_/¯ ]
Since a German site published a warning about BitLocker encryption being applied to all drives, and since I've not seen any info on specifics, I upgraded a couple of VMs, one Win11 Home & 1 pro to see what happens. The answer is not much. The AI features that Microsoft has been bragging about are initially only going to be available for hardware running the new ARM CPUs, while lots [most?] of the other stuff is going to be rolled out or enabled later on. Clicking BitLocker in Settings brought up the window showing it was off in Win11 Pro, and in the Home version it opened a page in the Store to upgrade to Pro for $99. The only surprise was that the old, somewhat standard method of bypassing hardware requirements, replacing appraiserres.dll with an empty txt file with the same name, didn't work. I used another trick instead, running setup from the Run box with the switch /product server. Don't panic when it says installing Windows Server -- it's not. I Do Not know 1st hand if using Rufus & enabling the bypasses works, and I do not know if running setup from the files that Rufus puts on a USB stick will work to upgrade to 24H2 if the hardware does not meet requirements.
neowin[.]net/news/windows-11-system-requirements-tpm-cpu-can-be-bypassed-via-this-single-command/#:~:text=user%20back%20in-,August%20of%202022,-but%20we%20were
Rather than enroll the VMs in the Insider program, which wouldn't work with one of them not meeting hardware spec anyway, I logged into the Insider site using an enrolled account and just downloaded the Release Preview ISO. FWIW, the upgrade took a bit less than 1/2 an hour -- the VMs are slower than running real hardware, but OTOH there's no software installed, so in that respect upgrading them is quicker. Since I didn't check during setup, once updated there were a couple of Windows updates, plus a few from the Store.