After running a 'zypper up' on 2016-03-01 and rebooting, plasma hangs on the
splash screen indefinitely. This means it is not possible to use the machine.

Running OpenSUSE LEAP 42.1.

Other notes:
- After the update, the shutdown dialog immediately does not work.
- I was able to launch kwin and plasma-shell manually from another tty but when
trying to launch any KF5 application I get errors along the lines of the
following:

dolphin: relocation error: /usr/lib64/libKF5XmlGui.so.5: symbol
_ZN15QGuiApplication35setFallbackSessionManagementEnabledEb, version Qt_5 not
defined in file libQt5Gui.so.5 with link time reference

This bug can be reproduced on a fresh user account.

Please see next comment for the packages installed by the update which breaks
plasma.

Suggesting high priority as this bug has rendered the machines affected
inoperable as the plasma shell does not load. It has been reported at least 4
times in the space of a few minutes in #suse this morning.