Digitec.ch has the Lumia 720 and Lumia 520 Windows Phones listed online in Switzerland. The former is available for CHF 399 ($420), while the latter is listed for just CHF 249 ($260). While both are not currently available, with no photos to join the listings, it would appear as though the online retailer is preparing for an imminent release. We're set to see both smartphones launch in Q2 2013.
So which colours are available for both Nokia Windows Phones? Digitech has black, yellow, blue, red, and white variants listed, though it'll be interesting if all colours remain present when the device launch.
Source: Digitec; thanks, Alek, for the tip!