Bosch is apparently working on extending the range of 2017 models via the use of a Y-cable that will allow its new drives to be connected to 2 batteries at once. The controller will switch the battery being used at regular intervals so as to allow both batteries to have roughly the same consumption. So basically you could have double the range of the current bikes if you bought a second battery. I'm thinking that this move is possibly being made to respond to more "professional" uses. Delivery services for instance...
Source:
http://www.elektrofahrrad24.de/news_bosch-ebike-neuheiten-news-ab-2017-12748#.VyxfrZNdanM
Source:
http://www.elektrofahrrad24.de/news_bosch-ebike-neuheiten-news-ab-2017-12748#.VyxfrZNdanM