The new Mac OS X version is coming soon. You probably read about all the features it has.
For our plugins, we are already looking into the developers tools for 10.9 and adding new features.
From the new features, we already prepared a few like file tags for both our Xojo and the FileMaker plugin.
If you have some wishes, please do not hesitate to ask us by email.
We'll post plugins with Mavericks features as soon as 10.9 is released.