There are several new features released in the latest patch of ArcGIS for Maritime: Bathymetry 10.2. The most exciting of these features is the support for additional raster formats.
Beyond the previously-existing support for Bathymetric Attributed Grids (BAGs), examples of the formats that are now also supported by ArcGIS for Maritime: Bathymetry include: GeoTiff, Esri GRID, ASCII Grid and more. Keeping in mind, while many of these formats are not specific to the bathymetric domain, ArcGIS for Maritime: Bathymetry is intended for the management and conflation of depth-based gridded formats.
For more information on what else is new with ArcGIS for Maritime: Bathymetry, check out the help topic here.