Alleged images of Nokia\u2019s aluminium Lumia handset codenamed "Catwalk" have leaked onto Chinese social network Sina Weibo, after being rumoured for months. The exact roots of the images are not known, but may provide a look at Nokia's next major handset. Pocket-lint is unable to confirm the legitimacy.According to past leaks, the Catwalk will boast a 4.5-inch display, S4 1.5GHz dual-core processor, 16GB of internal storage, 2000mAh battery and an 8.7MP OIS camera with LED flash. The images show the camera being centred around a hump in the middle of the device, rather than flat like the current Lumia line.\u00a0The Catwalk is believed to be 50 grams lighter than the brand-new Lumia 920, at 132 grams, and 2.3mm thinner, thanks to the aluminium design.\u00a0HTC notably opted for an aluminium design with its flagship HTC One handset that has been well received by reviewers. Given that Lumia devices have typically been heavy, the switch to aluminium may be a good move by Nokia.\u00a0As WPCentral points out, the Catwalk is rumoured to launch 15 May and will be available in June on T-Mobile USA and international carriers.\u00a0The leaked images also point to a micro SIM door, Micro-USB, and headphone jack at the top of the device. On the back there also appears to be a wireless charging port, signaled by the three dots.\u00a0Nokia has begun to step up its Windows Phone presence in the US. It is set to launch the Lumia 928 on Verizon later this month, though it won\u2019t sport an aluminium design.