Edit: please check the publishing date of this post if you didn’t and then come here for explanation
KDE is going to provide an ownCloud installation to let Plasma and KDE PIM (Kontact) users sync their data: you can already use ownCloud with cardDAV, calDAV and webDAV protocols to keep contacts, calendars and files synced across your devices, including the ones powered by Plasma and Kontact.
The next step is providing an ownCloud app to sync Plasma configurations and manage them. When work will be completed you will be able to load a Plasma session by specifying your username, password and ownCloud provider (KDE one or your own hosted one) and find everything synced: Plasma’s look and feel, ownCloud hosted files in Dolphin, your email account, contacts and calendar set up in Kontact and in general user’s apps configuration.
More coming soon.