Soprano 2.2.69 is the first release candidate of Soprano 2.3. It is intended to accompany KDE 4.3 RC1 to be released the 30th of June.
Soprano 2.2.69 features a range of improvements, most noticeably the introduction of the LanguageTag class and support for plain RDF literals.
A full Changelog will be released with Soprano 2.3 final.