I kept waiting to see if it got mentioned on Planet Debian, but no.
Transition block Jan 12 ish. Soft freeze later.
https://linuxnews.de/2019/01/debian-10-buster-wird-vorbereitet/
Ferdinand Thomas is very helpful, balanced and Debian savvy.
There is always google translate to convert from Deutsch - German to your language of choice.
To see what will be stranded for transitions, as always
https://release.debian.org/transitions/
This only affects Sparky5 Sparky 4 users are not affected.