The 01 Jul 14 Landsat-8 image was released today. Skies were clear over the calving front. Unfortunately LC80842322014182LGN00 being orbital path 84, row 232 just nicks the calving zone, providing the triangular overlap below. Image quality is not the best at the edge of its frame either.
Modis Aqua/Terra on 30 Jun 13 show more of the event but they are a couple of bricks short of a wall in terms of adequate resolution.
The bottom image in the 15 m slide show below has been painted to display different origins of ice arriving at the calving front, based on shear lines. This ice likely has different properties (temperature, thickness, velocity) depending on its origin which presumably correlate with where the calving front calves.
I'm very skeptical of journal displays indicating uniform velocity transects. We have an event here each fall where the students line up on a bridge at 1 m intervals, dropping rubber duckies into the river. As you can imagine, these hardly arrive at the next bridge downstream at the same time. I will put this matter to rest for Jakoshavn Isbrae the day we get our first pair of supersite radar images this fall.
It's very difficult to get a sense of volume lost, which after all is the main interest (increasing contribution to sea level rise). Rather than modeling the glacier, I think it would be better just to make accurate lidar measurements of the downstream fjord (noting tide level). Heights there imply depths since this is mainly ungrounded freshwater ice. Volume is then proportional to the surface integral of the DEM.