For Fedora 21:
kf5-kactivities-{devel,libs) in updates are at 5.12.0-1.fc21
kf5-kactivities in dvratil-plasma-5 is at 5.11.0-1.fc21.1.plasma5
Needs a rebuild to make the update go through, I guess.
Thanks in advance,
Michael
(Still need to switch to F22, I know...)