In an AA VM (fully updated, but clean from Alpha 1):
sudo add-apt-repository ppa:kubuntu-ppa/staging-frameworks
sudo apt update && sudo apt full-upgrade

I saw no warnings, and I re-booted.
krunner works, and invoking kinfocenter, I see KDE Frameworks Version: 5.36.0.
The kicker application launcher works, and Discover, Dolphin, Kate, Konsole, System Monitor, and System Settings all appeared to start normally.

For XX, on real HW, used Discover to re-enable the backports-landing PPA, and perform the upgrade.

I saw no warnings, and I re-booted.
krunner works, and invoking kinfocenter, I see Kubuntu 16.04, KDE Plasma 5.8.7 and KDE Frameworks Version: 5.36.0.
The kicker application launcher works, and Discover, Dolphin, Kate, Konsole, System Monitor, and System Settings all appeared to start normally.
The weather plasmoid widget did not show data, but I re-booted and it did the second time, so I guess it was probably a connectivity time-out the first time.

For ZZ, in a VM, used Discover to re-enable the backports-landing PPA, and perform the upgrade.

I saw no warnings, and I re-booted.
krunner works, and invoking kinfocenter, I see Kubuntu 17.04, KDE Plasma 5.10.3 and KDE Frameworks Version: 5.36.0.
The kicker application launcher works, and Discover, Dolphin, Kate, Konsole, System Monitor, and System Settings all appeared to start normally.

‎[07:48] ‎<‎BluesKaj‎>‎ mparillo, ok, I'll test that out
‎[08:22] ‎<‎BluesKaj‎>‎ ok mparillo, some old bugs remain, but otherwise the desktop and other graphics seem fine. Old bugs like changing fonts in system settings as root or mostly any changes to system settings as root don't hold the changes, I use a large montor so large fonts are needed for legibility. Also a new wrinkle, launching system monitor causes mtab fault popups by the tens..the only way to get out of the desktop freeze is to hold down ctl+alt+escape for
‎[08:22] ‎<‎BluesKaj‎>‎ 5 secs or so.