The KDE libraries are being methodically reworked into a set of cross platform modules that will be readily available to all Qt developers. The KDE Frameworks, designed as drop-in Qt Addons, will enrich Qt as a development environment with functions that simplify, accelerate and reduce the cost of Qt development. For example, KArchive (one of the first Frameworks available) offers support for many popular compression codecs in a self-contained and easy-to-use file archiving library. Just feed it files; there's no need to reinvent an archiving function.
The transition from Platform to Frameworks has been in progress for more than 2 years and is guided by top KDE technical contributors. Previews of the first Frameworks are expected to be released in December 2013.
Read more at the KDE blog.