Since it's rsyslog that's being removed, how much of the rsyslog.conf and rsyslog.d/*.conf will Journal understand?
My understanding was that the Journal authors were claiming that you could feed the data into the journal with syslog tools, but that accessing the data required new tools (due to all the new capabilities that the journal introduced), and that the files created were in a new, binary format to support the new anti-modification stuff (among other things)