Based on the Marvel Previews #105, May for July 2012, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Man #689
Amazing Spider-Man #689, Lizard variant cover
Amazing Spider-Man #690
Amazing Spider-Man #690, Lizard variant cover
Avenging Spider-Man #9
Marvel Universe Ultimate Spider-Man #4
Scarlet Spider #7
Spider-Men #3
Spider-Men #3, Dodson variant
Spider-Men #3, Pichelli variant
Ultimate Spider-Man #12
Guest Apps
Captain Marvel #1, ASM 50th Anniversary variant
Spin-Offs
Venom #20
Venom #21
Reprints
Essential Web Of Spider-Man Vol. 2 TPB
Man-Thing Omnibus HC
Man-Thing Omnibus HC, variant edition
Scarlet Spider Vol. 1: Life After Death Premiere HC
Spider-Man: Ends Of The Earth HC
Spider-Man: Nothing Can Stop The Juggernaut Premiere HC
Spider-Man: Nothing Can Stop The Juggernaut Premiere HC, variant edition
Spider-Man: The Complete Ben Reilly Epic Book 5 TPB
Spider-Man: The Next Chapter Vol. 3 TPB
Ultimate Comics Spider-Man By Brian Michael Bendis Vol. 1 TPB