IBM Traveler 9.0.1.20 is available for download on IBM Fix Central.  

There is a technote published that recommends upgrading to this release of Traveler if you plan on updating your Traveler servers to Domino 9.0.1 FP10 when it is released.  This is due to changes in some header files in FP10.  

The list of fixes included in the release is not yet published, however, there is a new feature:  Support for invitee availability search from Calendar on Exchange ActiveSync clients.

Link to technote