What is the difference between the soon to be released "new" version of the Logitech F710 (Logitech No. 940-00142) and the currently available version (No. 940-00145)? Was ist der Unterschied zwischen Logitech F710 und der "neuen" Version (Nr. Logitech 940-00142) und der derzeit verfügbaren Version (Nr. 940-00145)? danke.