
Reduser has a huge thread discussing this topic. Another report on the “Mystery” lenses can be found here. The lenses are labeled as “Made in Germany”. This is the banner on bandpro.de (with more details about the lenses available here):
… is rumored to be around 15,000.00 EUR a piece (over 21,000.00 USD).

Tvbeurope has an article with today’s date about the upcoming Leica cine lenses – the announcement was made by Dr Andreas Kaufmann: “These lenses have cost $10m to develop and are designed to fit the needs of future digital cameras. They can scale up to the demands of next generation digital cameras and are half [...]

UPDATE: on fdtimes you can see Dr Kaufman at the BandPro “Mystery Lenses” event and few close-ups of the different lenses: “In development for three years by an international team of prominent optical and mechanical lens designers (anonymous sources point to alumni of Panavision, Leitz, Leica Canada, as well as involvement by Otto Nemenz and Band [...]

Update #2: the domain name cw-sonderoptic.de is registered to Rainer Schnabel (perform a whois check for cw-sonderoptic.de) and of course he works for Leica: see this Google search. Update: a picture of some of those Leica cine lenses could be seen here (English translation). Rumors about Leica cinema lenses have been circulating for a while (see here and this link about [...]