Here is the report by Andrea Tornielli at the 'Vatican Insider' site. This is the English language version:-
http://www.lastampa.it/2017/01/25/vaticaninsider/eng/the-vatican/the-grand-master-of-the-knights-of-malta-has-resigned-Tn2G6iyuecWIZjZl7XS7fP/pagina.html
Interesting final paragraph - suggesting there was a rift between the English and German Knights; and restating the obvious fact that Cardinal Burke's has played a key role in this whole affair.