Despite the previous announcement at the Ubuntu Wiki, that said
Martin Pitt announces the date to switch Ubuntu Vivid to boot with systemd instead of upstart as Monday, March 9th. He says that the switch will affect the desktop, server, cloud, all flavors but not Ubuntu Touch, and that if there are too many regressions there is a simple upload to revert to upstart.
regarding Lubuntu, the Ubuntu Wiki now reports
LXQt is still in development, so Vivid Vervet [(*buntu 15.04, slated for release in April)] is another bug fix release. A late regression in the desktop installer for 32 bit means there is no Desktop installer for this milestone but it does not affect the alternate installer. Systemd is not the default init system.
LXQt is a light-ish desktop environment built with the Qt toolkit usually associated with KDE-compatible apps.
This announcement indicates that, for the time being, Lubuntu will be sticking with LXDE (Lightweight X11 Desktop Environment) built with the GTK+ toolkit usually associated with GNOME-compatible apps.
Upstart will remain the init system for Lubuntu for now.
(Score: 1, Interesting) by Anonymous Coward on Monday April 06 2015, @05:05PM
List needs to be updated -- Doesn't include Kwort Linux: http://kwort.org/ [kwort.org]