The same as they are now... available to read... The "enhanced" book will sell some where the effort is put into making something genuinely an addition to the book but most will end up being "also rans" just for the sake of it and probably pollute the field for others as has happened several times over the decades...
A lot depends on the types of books involved... non-fiction could benefit in many ways by other additions but I go with the additional comments on the Forbes page in that I'm perfectly happy with my imagination for fiction... it's always given better pictures and sounds than the TV or cinema...
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