Hello,
since some hours ago KDE SC 4.11.2 core packages are available in kdenext/experimental-snapshots. Soon, the rest of non-core packages are going to be updated as well and they will be (probably) moved together to kdenext/unstable the day of the official -2 release (october 1). In the meantime, feel free to post about any issues you may have, but please refrain to report anything to bugs.kde.org until the .2 release isn't official yet.