We just ran some preliminary compatibility tests with WordPress 4.6.beta1, and as we expected we don’t see any obvious problems, so if you like to live on the edge we are not going to hold you back 😉
This is of course far from being complete testing which we will do only when 4.6 will enter its RC stage at the end of this month.
This applies both to version 4.6.1 of the free plugin and version 1.0.3 of the “pro”. A new version of the “pro” plugin is scheduled to be released by the end of the month and it will focus on using the widget as a shortcode with various different layouts.