Sony has reportedly registered an updated PS5 model in Japan — but don't get too excited. This isn't some kind of PS5 Pro — we won't be getting that for years yet, despite what the rumours say — this is just a slightly adjusted version of the standard PS5.
So what's new? Well, it's apparently got "updated radio equipment", which is about as exciting as it sounds. The reason for this upgrade is unknown; it could be that Sony's now using a component that's cheaper to produce, or perhaps it's had to change things so that updated manufacturing standards can be met. In short, there's probably a very boring reason behind this adjustment.
It's worth noting that hardware tweaks like this are made fairly often — usually when the manufacturer finds ways to produce the device more efficiently. For example, Sony quietly released a lighter PS5 model last summer.