Based on the Marvel Previews #34, May for July 2015, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Man #20.1
Amazing Spider-Man #20.1, variant cover Nick Bradshaw
Amazing Spider-Man: Renew Your Vows #3
Marvel Universe Ultimate Spider-Man: Web Warriors #9
Spider-Island #1
Spider-Island #1, variant cover Ron Frenz
Spider-Island #1, variant cover Inhumans 50th Anniversary
Spider-Island #2
Spider-Island #2, variant cover Gabriele Dell'Otto
Spider-Verse #3
Spider-Verse #3, variant cover by TBA
Guest Apps
Ultimate End #3
The Unbeatable Squirrel Girl #7
Spin-Offs
Silk #6
Reprints
Daredevil: Typoid's Kiss TPB
Miles Morales: Ultimate Spider-Man Ultimate Collection Book 1 TPB
Marvel Universe Ultimate Spider-Man: Web Warriors Vol. 2 Digest TPB