From the press release for Plasma Active One, "As soon as the device is turned on, rather than the traditional grid of applications, you see the Activities view showing your current project, task or idea. With Activities, you can collect all of the documents, people, web sites, media and widgets related to a topic in one place, building personalized and interactive views of your life. With Plasma Active, the possibilities are unlimited. You can add as many things to an Activity as you wish with its “infinite scroll” feature. You can create as many Activities as you like and move between them using the touch-friendly Activity Switcher."
There's several screenshots of this new KDE tablet user experience within the press release. Plasma Active can be installed as a package and there are also live images available for those interested in testing this mobile user experience from the KDE developers.
The next release, Plasma Active Two, will be out in mid-December while Plasma Active Three is slated for release next summer. The next release will feature automated recommendations support, enhanced collection viewing, better filtering/sorting, and other capabilities. The third release next summer will be about better security, support for additional device form factors, and further customizations. Intel and ARM hardware will be supported by Plasma Active.
Visit Plasma-Active.org for additional details.