What a coincidence. Yesterday I wrote in a comment:
There's a fantastic segment on the Arctic Sea Ice Forum for discussing Greenland and its glaciers, with people presenting all kinds of analysis and satellite images. Really top quality stuff.
Well, the folks there (forum member Espen Olsen to be precise) have spotted a large change in Jakobshavn Isbræ, Greenland's fastest glacier draining 6.5 % of the Greenland ice sheet, between August 14th and 16th:
Espen reckons this is one of the largest calvings in many years, if not the largest. It also means that last year's retreat line has been passed now (date should be Aug 16 2015):