@Keen Right, right — the press release does say “the new Spider-Man will first appear in a Marvel film from Marvel's Cinematic Universe (MCU). Sony Pictures will thereafter release the next installment [sic] of its $4 billion Spider-Man franchise, on July 28, 2017”.
Sinister Six was announced for release on 11th November 2016, but I guess that would be an instalment (please note the correct spelling, Marvel) in the Spider-Man franchise, so presumably it’s either not happening, or has been pushed back to a later date.