Pong World is not the Atari take on McWorld (hey, it could happen). It’s the winning entry in Atari’s Pong Challenge, which has just been officially released on iOS. It’s the “first-ever official new PONG game for smartphones and tablet devices,” at the cost of all those unofficial ones.
Pong World by zGames is a version of the ancient game with upgradeable (animal) paddles, special bonus abilities, and varying stages full of environmental hazards. You can see the game for yourself with no risk, except for the risk of extreme irritation after playing against the first AI opponent, who can curve the ball mid-flight. Pong World is free-to-play.