Update: Windows 9 is now known as Windows 10. Want to know more about when you can get your hands on it? Check out our in-depth Windows 10 release date page
That's according to unnamed sources speaking to NokiaPowerUser, so as always we'd take it with a pinch of salt given that we don't know how credible their sources are.
But if you're wondering whether you'll be able to get Windows Phone 9 on your current device then you might not need to worry, because apparently it will be available for all existing Windows Phone 8 devices.
Low on details
Actual rumoured features of Windows Phone 9 are thin on the ground but we've heard in the past that it could be major overhaul of Microsoft's mobile OS and that it may even be merged with Windows 9.
Whatever the case, NokiaPowerUser warns that one rumoured feature, split-screen multitasking, might not be available for smaller screen devices, which makes sense.
If Windows Phone 9 really is coming in January then we're likely to hear a whole lot more about it over the coming months, so stay tuned.
- Windows 9 is on its way soon too.