Fox have slotted Night at the Museum 3 onto their release schedule for Christmas Day next year. Word first broke out into the public domain via ERC:
Fox’s NIGHT AT THE MUSEUM 3 will start taking tickets on 12/25/14. Shawn Levy directs, Ben Stiller stars.
— Exhibitor Relations (@ERCboxoffice) February 7, 2013
There were at least tentative plans for Night at the British Museum before. I’ll be curious to see if this is the way they take it now.
At this stage my main hope for the threequel is that they find new writers. I know this is really Robert Ben Garant and Thomas Lennon‘s thing, and it might seem pretty harsh to send them packing but I don’t think they really hit the right notes in either of the first two films.