Hi,
The override system for the images is the path :
JPATH_THEMES.'/'.$app->getTemplate().'/html/hikashop_image.php'
The override file can contain several functions to override the way that images are displayed.
But it does not override a specific file. It is just a PHP file which will contain function for the HikaShop Image Helper.
This override system still work but it is now easier to customize the way that the images are displayed in HikaShop.
With the integration of Shadowbox, we changed own the image popup (and thumbnails) can be made, the HikaShop Popup Helper have now functions for the image popups (mootools and Shadowbox) and we hope that we can add more integration in the future.
Regards,