Following consultations and much work by the Horizon 2020 Advisory Groups and others, the European Commission have now published a set of draft scoping documents for 2018/20.
Although still subject to ratification (and as such open to some change), these documents give a clear indication of key topics which are likely to be adopted later in 2017. They set outline the main priorities over the next three years for each area of Horizon 2020 and will be used as the basis for developing work programmes.
You can access a zip file containing all of the scoping documents here. As these documents are in the public domain, you can also share them freely with your potential collaborators.
As ever if anything catches your eye, you want to know more, or just need help navigating the information do get in touch (firstname.lastname@example.org).