We still don't have any official word, but another independent report has stated that Sony is indeed working on a "PlayStation 4.5."

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We first caught wind of a possible PlayStation upgrade last week. According to Digital Foundry , Sony's research and development labs already have prototype devices, and its sources are calling it the "PlayStation 4K."However, despite the name, Digital Foundry speculates that "while more GPU power is being offered to developers, realistically it is nowhere near enough to provide native 4K gaming at the same quality level as current 1080p titles."It goes onto suggest three theoretical options for the console - a tweaked console with increased processing power, a console that offers selected 4K features (which could split Sony's market), or a slim PS4 with small performance upgrades. For more on that, check out Digital Foundry's story.We've contacted Sony for comment, so keep it right here on IGN for all your PS4 news

Matt Porter is a freelance writer based in London. Make sure to visit what he thinks is the best website in the world , but is actually just his Twitter page