Sony recently revealed the subscription plan for PlayStation Now, which gives players access to an online library of more than 100 PlayStation 3 games, but it might take a while before you'll be able to use the service to play PS2 and PS1 games.

"There are some amazing games for PS1 and PS2 and our longer term vision is to go back further into the PlayStation generational library and offer those with PlayStation Now," the streaming service's Director of Marketing Peter Jamshidi said in response to a question from a reader on the PlayStation Blog. "Right now however, we are focused on bringing to users experiences from the amazing PS3 library."

Back in September 2014, Sony suggested that PlayStation Now could be used to stream PS4 games as well.

Earlier this week, Sony announced that it will launch a subscription plan for PlayStation Now on January 13. For $20 per month, or $45 for three months, users will get unlimited access to the full library of PlayStation 3 games. At the moment, PlayStation Now users can only rent individual games, paying as much as $5 for four hours of access to titles such as Deus Ex: Human Revolution. 90-day subscriptions to individual games, meanwhile, can cost as much as $30.