I guess is the end for vita... don't see them making another handheld after vita mess. Even 3ds not doing as well as ds. The world going tablets and phone for casual games, left a small amount that like to play hardcore game on the move.

Wut?

You only need PS4 and PS Vita.

No need router

Switch on your PS4, switch on your PS Vita

Link them both with extra guide show before hand

Done

 

Never tried before, but my guess it still work, because it show u as a guest in the screen if you play on local multiplayer game with ur friend with the same game

PS Vita can be ur second controller if you only have one controller for the PS4
If only you want to remote play from far far away... within same room or next room, theres no need internet or router thingy.