Sony is pressing play on a new web-based television service that represents an attempt to transform the way people watch based on its experience in gaming. Called PlayStation Vue, the service initially will require a PlayStation gaming console and will offer a personalized, searchable approach to watching live and on-demand television that is delivered over an Internet connection. Sony plans to announce this subscription service on Thursday and will start testing it this month with a select group of viewers in New York. It will be offered in other cities in the first quarter of 2015.