They usually reduce the quantity of content during July-August. We have enough content until October and I can make a small list with that.
July - Two holidays weeks with very low content like Mail to Orders and Blood Bowl star players. The Horus Heresy Knight and the Underworlds Skaven or the Warcry Starter would be good releases for the rest of the month.
August - One or two weeks with very low content. They have a lot of kits allowed only on big boxes to sell like the Agastus boxset, Arks of Omen characters, Warcry and Kill Team warbands and, of course Epic.
September - 40k month. Space Marines, Tyranids and starter sets. (They are gonna show the new models on two weeks, and It is gonna be BIG), and of course the Cities armybox.
I want to say something about the Cities box. They are not gonna sell It before the Nova Open, It is impossible because the Battletome would reveal kits that they don't show yet.