Which means buying the 3-disc set will give access at least to the 4K version of To Catch a Thief, and if Paramount does upgrade Love Story to 4K, that master as well digitally. Not sure about the US, but Paramount digital copy in Canada is currently exclusive to iTunes/Apple TV.
Not likely. Paramount is probably repackaging old stock of the 2012 release for this set. Might be worth getting if you want the earlier pressing of To Catch a Thief, though.