Bloody-Disgusting.com spotted a casting call post on Mandy.com, which mentions a Jaws reboot. The post reads, "We are seeking all crew positions for the upcoming Jaws reboot. We will need to build sets quite early therefore we will be hiring partially prior to the official pre-production."
The site also lists production of the Jaws reboot starting in January of 2015. The original Jaws movie was released on June 20, 1975, and it defined the concept of a summer blockbuster. There were three sequels to the original Jaws. The last of which was Jaws 4: The Revenge, which was released on July 17, 1987.
Of course, the casting call listing could always be fake, so this report should be treated as rumor for now. But Hollywood does have a tendency to produce movies about whatever is hot at the moment.