Assassin's Creed, Call of Duty, Watch Dogs, and Battlefield are all coming out on the current crop of consoles, but they'll also see separate releases on the PS4 and Xbox One. That leaves us with a burning question: Do we play these games at launch, or wait for the next-gen release? Turns out, you can do both. To help ease the transition to the new systems, these four titles can easily be upgraded from the PS3 to the PS4 version for a nominal fee.