The XNAT 1.6.3 release is a maintenance release with almost 300 issues fixed and resolved. You can find details about many of these issues in the 1.6.3 Resolved and Closed Issues spreadsheet.
Series import filters allow side-wide and project-specific whitelists and blacklist filtering of DICOM series. Applied at:
Better management of file handling in prearchive:
There are lots of changes to the administrative functionality:
Changes for 18.104.22.168
See the updated page for XNAT 1.6.2 Release Notes