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MTV's brief description:
"Neighbors" tells the story of Mac Radner (Rogen) and his wife, Kelly (Rose Byrne), a married couple that are in need of some next-door friends, but when a fraternity moves one house down from them, their attempts to reach out the house leader (Efron) doesn't go over so well. The married couple and their new baby don't mix well with explosive ragers, horny college kids and the "balloons" that are left on their lawn the next morning.
What results is a dangerous game of back and forth between the Radners and the fraternity brothers of Delta Psi. The frat throws a big party in their backyard complete with fireworks, so the Randers cut off their power. The Radners cut the power, so Delta Psi installs airbags into Mac's chair at this office. Needless to say, things get out of hand.
first and second, both via @zacefron_news, last from usatoday
as i've said elsewhere, he must be prepping for something based on his working out etc but i don't think zac is actually filming something new right this second and definitely not autobahn or you belong to me. but it seems a very conscious decision of his not to go since this would be great coverage for him. with an ensemble film, they have plenty of representation with other important cast members to make up for his absence which is great since it allows him the flexibility not to go since something certainly new and worthwhile is afoot.