The service will cost under "£50 per year," notes the site.
As an added bonus, all users of the premium subscription will receive a fee PSN game each month, from a choice of up to four that change each month. After a few months, if you count the free games as money back to yourself, you break even on the subscription.
One of the expected new features is an unlimited streaming music app similar to Spotify.
As for cross-game chat? That will be a free update for all users, not part of the paid sub. When it will be released is a different matter.