A new low-end Lumia device has been revealed in an Indian Import listing. It is codenamed RM-977, and as per the listing it is a single sim device with touch and a screen size of 4.5 inch. This code RM-977 is still unclaimed by any other device, so it is pretty much a new device.
The quoted price of INR 7,966 is just above Lumia 520’s price across the entire Lumia product range and it certainly gives rise to a very interesting possibility. Lumia 525 has been quoted by Nokia as a Lumia 520 variant. So, may be this is the real Lumia 520 successor with 4.5 inch display.