Sony's patent already tells us this is a thing. Not sure if it will be used for PS4 games, though. I think Sony is definitely aiming for PS5 to be B/C with PS1, PS2, and PS4. Hopefully, they get PS3 on there, as well.
But, it seems they want devs to be able to insert higer-res assets into the games as easily as possible. I'm sure this will come at a small price, like $4.99 for a PS1 Classic (the same ones that are already on the store), and another $4.99 for the update patch. Not sure how many devs will take advantage of this, but it is a chance at extra revenue for old ass games without all the resources and risk of a full remake. It may also incentivize devs/pubs to put more Classics on the PS4 Store.







