Justin Karneges recently released the "test1" version of QCA. Read the announcement here. There will be a "test2" release soon, and the final release is scheduled for 4 September 2007.
If you have an interest in crypto, or Qt APIs, or (ideally) both, note that we are providing Binary Compatibility and source compatibility from QCA 2.0.0 release for the duration of Qt4. If the API doesn't do what you need, now is the time to tell us. After 2.0.0 we will do additions, but nothing that will break BC.