Every time Nokia has launched a flagship device, it is followed by a successor to the same. There are speculations of a successor to the new Nokia Lumia 920 in the making which is supposedly called 'Catwalk'. This is a lighter version of the same, however, the building material is aluminium that is supposed to make it lighter and thinner bringing it at par with iPhone 5. The rest of the specs will remain the same as the Lumia 920. Currently, Nokia uses a poly-carbonate body for the Lumia range of devices. Nokia did use an aluminium body earlier as well with Nokia N8.
Source: theverge
