/e/ have just announced that they’ll start the pre-order phase for the “Murena FP4” today.
That posting refers to an upcoming newsletter but that link is not - yet - valid.
Edit: on Twitter I saw that shipment is supposed to start January 11th, 2022.
I have to admit I don’t know how they handled the downloadable version for self-installing in the past. But in any case I assume it won’t be too far before or after this date.