Dishonored definitive edition is only $20 for ps4 owners?

With the definitive edition of Dishonored 1 available to preorder, Playstation has given the option to upgrade from PS3 edition to the PS4 edition at the price of $20 instead of buying the game full price. This option only appears if you own Dishonored 1 on PS3. This deal saves you 50% of the original price on 39.99. The game releases on August 25th and wil take up a whopping 30GB of space but includes all DLC along with HD textures and resolutions.