The digital version of LittleBigPlanet 3 is part of two official PlayStation 4 Black Friday bundles from Sony. It is going to be packed in with Lego Batman 3: Beyond Batman, which will come in a physical disc, in addition to the standard 500 GB Jet Black console. Take a look at the bundle on Amazon with this page. The other major bundle composes of a disc version of Grand Theft Auto V along with a voucher to download The Last of Us Remastered.
The LittleBigPlanet series has received a lot of post-launch support over the years with a constant stream of patches and DLC packs. So it is likely that the third game will have a much bigger file size when it is all said and done.
LittleBigPlanet 3 is coming out on the 18th of November for the PlayStation 4 along with the PlayStation 3. If you haven’t already, you can go preorder the game with this link.