Nokia is planning a new line of Lumia Windows Phone devices for 2013. Sources familiar with Nokia's plans have revealed to The Verge that the company is planning to switch to an aluminum construction for at least one high-end Lumia Windows Phone planned for release this year. The change is a move away from Nokia's traditional polycarbonate body for its Lumia devices and will mean the new device, codenamed Catwalk, will be a lot lighter and thinner than the existing Lumia 920.

We understand that Nokia is also planning another two Lumia handsets that will debut as part of a new line up this year. Nokia's Catwalk device is designed as a successor to the Lumia 920 and will debut as a replacement to the company's current Windows Phone 8 flagship with similar internal hardware specifications. A move towards aluminum brings Nokia back to the pre-Windows Phone days when the company launched its first Symbian 3 device, the N8, in a range of vibrant colors. It will also allow the Finnish company to compete against Apple's iPhone size and weight, something that it was unable to do with the polycarbonate body used in the Lumia 920.

Expect to see Nokia's Catwalk device debut later this year.