From modding PS4 games, using cheat engines, dev modes on PS4, and even running Linux, Cemu and Wii all on the PS4! That's right, you can even run Wii U games on a jailbroken PS4, and I'm going to ...
However, dreams of universal access to PS4 content from anywhere via the Vita will have to wait, as even locally, Remote Play suffers from issues similar to those encountered by Wii U users.