I guess merlin1991 will update the changelog shortly (or maybe even MohammadAG will do), for now there's MohammadAG's announcement post as linked above.

BTW even when installation of the certman stuff somehow fails there's no impending doom in that, it's a mere minor display_info issue, most users won't ever notice the difference.

Doom pending in using fapman or apt to do the update is unclear, seems both are more prone to mess with package management state of some packages, so you might more likely run into missing or wrong-version pkgs on next update - though all that is anecdotal. Fact is it's simply not supported, tested, or otherwise encouraged by CSSU team, and for sure doesn't help to improve the quality of Testing releases, unless you actually analyze what exactly your acme appmanager does and if it's to be considered safe so it can get included to officially supported methods for update. For this to do you first need to understand what HAM does, so you can compare and evaluate ;-)

cheers
jOERG