At today's PS4 event in New York, Gaikai explained how it's improved remote play for its upcoming home console. One way Sony was about to do this was integrating Sony's Gaikai cloud tech into the console, turning the machine into a server and making the PS Vita a client.
What's more, Gaikai boss David Perry said his company is exploring long term options to make PS3 game "ubiquitous on any device". The cloud tech is advanced enough that one day, Sony could put PS1, PS2, PS3, and PlayStation Mobile games on any device, including the PS4. According to Sony, it would change the idea of game longevity.
To do this, Sony needs to build the fastest mobile network ever made — something Gaikai has experience doing.
Until then, PS1, PS2 and PS3 games will be playable on the PlayStation's cloud service.