During the 2013 CP+ show in Japan, Voigtländer quietly announced a new Nokton 50mm f/1.5 Asph lens for M-mount based on their classic L39 design from the 1950s (see eBay listings, images on flickr). The US price of the lens is $899 for the black version and $1049 for the silver model. Here are the lens specs:
The new lens is expected to be released this summer, price was not announced: