The upgrade is free to registered users of any v2.x release. A 21 day trial version is available. A single-user licence is US$199.
The release notes for v2.6.2 list the following changes:
Version 2.6.2 release notes
Preliminary support for DNG file format. This version imports and displays DNG files in preview mode, as well as, import and export user annotations in both IPTC and XMP format. (Sidecar files are used during import only).
Improved exporting annotations in XMP format back to TIFF, JPEG or Photoshop files, in order to make iView MediaPro fully compatible with Adobe Photoshop.
Corrected issues when resetting folders with long names (Mac).
Corrected issues related to saved catalog files without creator code (Mac OS 9).