Thanks to a instagram account called "@mini_legogo" I know that lego will release more 2 (or even more) police sets .
-The first set is 60273 and is probably called "Heavy Driller Pursuit" because includes a Police car and a Small Red Driller, this set have two exclusive minifigures from Lego City Adventures tv show. Sam Grizzled and Hacksaw Hank, Sam Grizzled now have a new suit that sounds strange. A new police subtheme !?
-And the other set is 60274 and had an helicopter, a raft and a dockside lighthouse, but this set don't include new exclusive minifigures but includes Rooky Partnur and Vito. This set can be called "raft arrest".
I don't know the release date, probably august like the avengers sets.
Here is a vĂdeo that shows the new summer Police sets.