There will not be a 1500 IP limit in H2H, only a 162 game limit. The 2 SP slots effectively replaces all IP limits, both on a game and season-long basis.
As discussed in this thread, there will not be a change to the trade deadline. It is a universal deadline across all Ottoneu leagues and will affect everyone who has playoffs enabled equally, since playoffs will begin on September 3 of this year for all leagues that opt-in to the playoffs.
Hope that helps!