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Who knows. From what I gathered Sony MAY be interested in letting Marvel have Spidey thrown in for the Avengers, after all the Iron Patriot IS Norman Osborne, but from the reception of The Amazing Spider-Man 2 it will be up to Sony, if Spidey 2 does well at the box office they won't bother but if the sequel blows they may give the rights back to Marvel...then again they did say they MAY be interested in working with Marvel...
...in my honest opinion...Sony would have to be incredibly STUPID not to let Spidey join in on the Avengers, the box-office profits it could make for them as it does for Marvel and the studios that made Avengers...
Fox sucks for not giving up Wolverine and the X-Men...