The head of Sony's Worldwide Studios has revealed that the PS4 was developed alongside Sony's other new console, the PS Vita.
This makes sense from a timeline perspective, but it does highlight how long the PS4 has been in development. The PlayStation Vita released towards the back end of 2011 in Japan and was seen a few months later in North America and Europe.
"PS Vita was a shorter project compared to PS4, but Mark [Cerny] and Worldwide Studios were involved in both projects, and we worked on both projects simultaneously," explained Shuhei Yoshida, while talking to Edge Magazine.
At present, the PS Vita links up quite well with the already existing PS3. Many games in the West feature cross-play, whereby if you buy the PlayStation 3 version, you will also be given the Vita version of a game.
With the PS4, this has been upgraded somewhat. Sony has already revealed that PS4 games will be playable on the Vita via Remote Play, which shows the power of their handheld platform.
In other PS4 news, Sony recently revealed that the console would ditch backwards compatibility. The decision was made for technical reasons, as it would have only been possible by putting the Cell Processor in every PS4.
The PlayStation 4 is scheduled to release towards the end of this year, which would be two years after the launch of the PS Vita. There are also hopes that the console will release worldwide this year, unlike previous PlayStation consoles, which have seen staggered releases for some territories.
At E3 2013, Sony are sure to reveal more information about how the PS4 and PS Vita can work together. We should also get to see what the actual console looks like.