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Staking a date for a sequel to the yet unseen Fantastic Four film represents a leap of faith on the part of the studio, given the middling box office performances by Fox’s previous FF films. Though the reboot has been cast (see "'Fantastic Four' Cast"), it is not yet completed. At one point it looked as if Fox might give up the rights to the Fantastic Four, but given the current cachet of Marvel-based movies (and the experience of Paramount, which gave up on Iron Man only to see Marvel Studios turn it into a hugely successful franchise), that appears about as likely as a remake of The Lone Ranger.
Of course it is not as if Fox’s Wolverine movies have exactly set the box office on fire. The recently-released The Wolverine earned a bit more overseas (about $414 million vs. $373 million for 2009’s X-Men Origins: Wolverine), but it brought in nearly $50 million less here in North America where the studio gets a higher share of the take, so it is difficult to see either film as a big moneymaker for the studio, though Fox did a good job on keeping the costs lower on the 2013 film ($120 million). The 2009 Wolvie film debuted during the first week in May, while the 2013 film bowed in late July. Moving a third Wolverine film to March is a bit of a risk, though it should make for less box office competition.
Deadline reports that the studio is in no hurry to reveal the identity of the unnamed Marvel-based movie slated for July of 2018, though fan speculation will undoubtedly focus on some sort of X-Men film or spin-off.