The new draft of the BIP has been posted to the bitcoindev mailing list:
https://groups.google.com/g/bitcoindev/c/nOZim6FbuF8/m/d4tkNi0DAQAJ
The code has been published here:
I'm looking forward to hearing your feedback.
GitHub
Comparing bitcoinknots:29.x-knots...UASF:29.2.knots20251010+BIP444 · bitcoinknots/bitcoin
Bitcoin Knots enhanced Bitcoin node/wallet software - Comparing bitcoinknots:29.x-knots...UASF:29.2.knots20251010+BIP444 · bitcoinknots/bitcoin