Appears to be confirmed from all sources!

EDIT: VARIETY HAS CONFIRMED. DEADLINE HAS CONFIRMED. MARVEL HAS CONFIRMED!

(Art gleefully stolen from somewhere on the internet. MoviePilot.com, I believe.)

From Deadline:

Under the deal, the new Spider-Man will first appear in a Marvel film from Marvel's Cinematic Universe, and then Sony Pictures will thereafter release the next installment of its $4 billion Spider-Man franchise, on July 28, 2017. There had been rumors that Sony might sell the webslinger back to Marvel and Disney but that's not what is happening. Instead, Sony keeps its top franchise but this opens the door to Marvel Comics' biggest superhero being able to cross pollinate in the Marvel universe. That has been a key benefit in launching Marvel hits from Iron Man to The Avengers. There had been talk that Spidey would surface in an installment of Captain America. Now, that can happen.

From THR:

From Variety:

Full Deadline article:

http://deadline.com/2015/02/spider…

FURTHER EDITS: THR's latest email blast is reporting that Disney is going to juggle the Marvel release sked to accomodate the partnership, but the link is taking me back to the original article.