Some formats that can be considered are JPEG 2000, CALS, GIF, IOCA, JBIG, JBIG2, TGA, TIFF, EXIF, ICO.
The feature will be available in 2015 Q3 official release. The supported built-in formats are: For import: JPEG; PNG; BMP; TIFF; GIF; ICO. For export: JPEG; PNG; BMP; TIFF; GIF; We have also prepared an SDK example which uses a third party library and demonstrates how to import/export additional formats (JPEG 2000, TARGA, WMF, EMF, EXIF): https://github.com/telerik/xaml-sdk/tree/master/ImageEditor/CustomImageFormatProvider