Yes that new digiglobe imagery for Petermann is absolutely fantastic -- I had no idea what I was looking at before on Landsat or Sentinel images which do not quite have the resolution to match intrinsic feature size.
Below, the central drainage channel in the Petermann ice sheet looked like it had a transverse fault, but no, just a change in channel.
However the biggest thing to happen to Greenland glaciology since the invention of the sled dog is the availability of fast free adaptive contrast adjustment, CLAHE (see FIJI, ImageJ2 process menu) -- snow on ice has really poor contrast and the Digiglobe images are generically enhanced, not specifically adapted to the Greenland ice sheet. They're even better than they look.
Applying the filter is like lifting a sheet of wax paper off the original image!