Offical LineageOS 19 was released today, with support for the OnePlus 6/6T & Google Pixel 4 that WundermentOS supports. I’m sure more devices will be coming along shortly as the maintainers get them up to speed.
Unfortunatly, some devices will not be able to support Android 12 due to some under the hood changes that Google has made to the network code. Exactly which devices this will be remains to be seen, but 18.1 will continue to be built for these devices.
Work has been started on porting WundermentOS to 19, and test builds have been running for a while. All functionality has been maintained with the exception of the Network Location Provider (NLP). NLP is currently not working with Android 12, but as soon as it had been updated it will be included.