Nothing concrete as yet for the next release after Avengers. I read Pinside on a daily basis and at the moment, Metallica is being thrown around as the next release, then Star Trek....then somebody will come out of the blue and dispute Metallica as a pinball release. Like the Avengers rumour, Star Trek is the only real certainty at the moment.
Toy Story is another title that has been suggested in the past few days.
Cheers!
Adam.