The latest version of KOffice 2.3.0 has finally been released today. More information available in the announcement that you can read either on koffice.org or on the brand new website calligra-suite.org. Among improvements, a lot of bug fixes, performance, and especially Krita has reached the quality level required for users to make art with it, as shown in the video in the Krita announcement.
But this release also brings new features, such as a slide sorter view, or support for viewing annimations in KPresenter (as shown in the video below), a new color selector or canvas rotation in Krita. More detailed information available in the KOffice 2.3.0 changelog.