Yep, Marvel did come try and broker a deal with Sony, according to more spilled Sony e-mails. It sounds like they made a decent offer, Spidey shows up in Captain America 3, but Sony retains distribution rights for the Spider-Man series. But, it didn't work out.
Still, Sony is still pow-wowing on how to get their one comic book franchise to be a top contender, throwing a "Spidey Summit" in January. As it stands, the future Venom, Sinster Six and Unnamed Female Character movies are still in the works.
So Agent May Parker is still a possibility!