Full details on the new Leica Cinema lenses can be found at bandpro. The price is not publicly announced, but you can get a quote (I just did). I am sure it will be a 5 digit number (for one lens, in US$).
Here is the actual size of one of the Leica Cinema lenses:
See previous posts on the Leica Cinema lenses here. The rumor has been around since 2008!