It's not exactly new in terms of an app. A few years ago I tried an app called Shoebox that does just that but getting the right light to take pictures of pictures is a bit of a pain so I never really scanned more than a handful of pictures.
I'll give this a try later, unfortunately I suspect it won't support adding a date when scanning an image so the chronology will be all off unless you edit images one by one.
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The app looks interesting, but the voiceover is sooooo condescending.