Ryanair Summer 2017
This seems to be the current total for weekly rotations, month by month, through the main part of the summer season.
May 2017 113 weekly rotations, the same as May 2016
June 2017 112 weekly rotations, 7 fewer than June 2016
July 2017 118 weekly rotations, 2 fewer than July 2016
August 2017 129 weekly rotations, 3 fewer than August 2016
September 2017 119 weekly rotations, 1 more than September 2016
There are 30 routes which is one more than last summer with Bucharest the new one (it starts this winter), although the Treviso route has been moved to Marco Polo (it was actually switched several weeks ago and operates there now), no doubt to compete directly with easyJet.
Ryanair has been adding frequencies since the first draft appeared in its booking engine a few weeks ago. July for example only showed 108 weekly rotations originally - Reus and Bergerac had been left out, as they were last year initially, and extra frequencies have been added on one or two sun routes.
Sun routes actually make up most of the shortfall from last summer. I would not be surprised to see Ryanair add further frequencies on some before the season begins. They did this through last winter prior to summer 2016 and in past years. They will have to do something if they are to justify their claim of a 5% increase for 2017.
A poster in another forum also suggested that more flights will be operated by non-based aircraft meaning a reduction to 4-based aircraft, which so far is BRS is concerned ought to help with the morning rush a bit. In 2013 the base was reduced to two aircraft after a reported disagreement with the airport over charges but no flights or destinations were lost and it led to about half a dozen Ryanair aircraft arriving and departing in the relatively quiet period of early/mid evening.