Panasonic patent discloses f/1.8 prime lens series.

The recently published Panasonic United States Patent 8749893 discloses a lens design description for a f/1.8 prime lens series. The mentioned lenses are:
12mm f/1.8
16mm f/1.8
26mm f/1.8
30mm f/1.8
50mm f/1.8

All have a similar kind of design and inner focusing. As usual with patent it’s hard to say if these lenses will ever become real products.