Update May 20, 2015 at 5:36 p.m. EST: An earlier version of this article incorrectly quoted Marvel editor Ben Morse as confirming two Spider-Men after Secret Wars.
Newsarama apologizes for the error.
Additionally, although Morse stated there would be no Uncanny X-Men #35, Marvel has reached out to Newsarama that there would be a Uncanny X-Men #35, to come out during the summer.
Updated Story: In a recent live chat, Brian Michael Bendis talked Uncanny X-Men, Ultimate End, Guardians of Knowhere and Old Man Logan, revealing some key pieces of information in the process.
Bendis seemed to confirm that the recently delayed Uncanny X-Men #600 would take place prior to Secret Wars, saying "Well, there's no Marvel Universe post Secret Wars." While this is hardly an outright confirmation, it does seem to raise the question of why Uncanny X-Men #600 was delayed til after Secret Wars concludes.
Bendis also shared some exclusive art from Uncanny X-Men #600, as well as a new page from Ultimate End, and a first look at a new villain from Guardians of Knowhere.