A Twitter post from Boston Herald writer @DGoodison indicates that 75 Seaport is looking to open on Seaport Boulevard about a half mile west of 75 on Liberty Wharf, which is located on Northern Avenue (just east of where the road becomes Seaport Boulevard) and is owned by the Hampshire House group. A post on the Fort Point Boston blog shows that The Hampshire House is indeed also behind the proposed 75 Seaport, which is being introduced at a neighborhood meeting this evening. Very little is currently known about 75 Seaport at this point in time; as soon as we find out more about the place, we will post an update here.
In addition to 75 on Liberty Wharf, the Hampshire House group also operates 75 Chestnut and Cheers--both of which are in the city's Beacon Hill neighborhood--and another location of Cheers at Faneuil Hall.
The address for 75 Seaport is 60 Seaport Boulevard, Boston, MA, 02210. The website for the Hampshire House can be found at http://www.hampshirehouse.com/
Thanks to @FPNA_Boston supplying additional information on this story.
[October 31, 2017 update: Boston Magazine mentions that the new place will actually be called 75 on Courthouse Square.]
[November 30, 2017 update: The website for the restaurant states that 75 on Courthouse Square plans to open in January.]
[January 22, 2018 update: The Tables section of The Boston Globe says that 75 on Courthouse Square opens for dinner on Friday, January 26 (this has been confirmed by the restaurant).]
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[A related post from our sister site (Boston's Hidden Restaurants): List of Restaurant Closings and Openings in the Boston Area]