Systemd 202 has been released and it begin experimental work on supporting kdbus, the implementation of D-Bus within the Linux kernel
. There's also other fixes and features to this new systemd release.
The recently introduced libsystemd-bus library received substantial development during the 202 cycle to work in conjunction with the experimental kdbus kernel module. Lennart says that it works "enough to exchange messages with some sophistication" but that kdbus isn't ready yet and right now the library is mostly just a big test case.
There were also improvements to "systemctl list-jobs", a new systemd unit, improvements to libsystemd-logun and systemd-nspawn, and numerous other changes.
More details can be found in the mailing list announcement