A recent update to the Photos app in Windows 10 for Windows Insiders on the "Skip Ahead" ring has renamed the app to Story Remix. Initially spotted by the folks at MSPU, the new name seems to be the only thing that has changed, with no new features added in the update.
Story Remix itself was originally detailed at Build 2017 earlier this year as a new set of features headed to the Photos app with the Fall Creators Update. With Story Remix, you can quickly create video clips from photos and videos in your library, complete with music, transitions and text. Some interesting 3D features were originally shown off as part of Story Remix's repertoire, but those have since been delayed to some time after the Fall Creators Update arrives.
As far as the new name is concerned, it seems that may not be set in stone either. Brandon LeBlanc, a Senior Program Manager with the Windows Insider Program team noted on Twitter that Story Remix is just one name that the team is currently considering.
In any case, it seems the default Photos app will likely end up with a new name when the Fall Creators Update arrives later in 2017. Of course, things are always in flux, and it's entirely possible we could see the app name reverted as well.