Alrighty, an ASIC is a piece of hardware specifically built to do one special thing. Just like a Thumb Stick stores data, or a speaker to play sound. A Bitcoin Miner Application-specific integrated circuit (aka BTC ASIC) is a piece of hardware that can only specifically mine Bitcoins.

A Playstation 4 on the other hand is specifically built to play video games, however if it is exploited and allowed to use the APU built onboard for other uses, it could possibly be used for OpenCL commands such as Bitcoin mining... However Bitcoin Mining on a GPU (Graphics Processing Unit) or an APU (Accelerated processing unit, which is just a nickname for a combo CPU/GPU) is extremely inefficient due to the high power draw to hash rate ratio.

Seeing the profitability of an ASIC is literately unpredictable due to not knowing exactly when they'll hit the market, nor what the hash difficulty is at that time. Another variable is the hash difficulty once they reach the market... As the difficulty changes every 2106 blocks.