Image source: xinhuanet
Not only big and well known companies do produce lenses for mirorrless systems. More and more Chinese companies are now entering the market by offering cheap manual lenses. The most famous of them is certainly which makes the 35mm lenses for M43 and NEX.
Zhongyi Optics from China is developing a 28mm f/2.8 lens for Sony NEX and M4/3, which will be 4 group 5 lenses design and use rotary aperture like the loreo lens in a cap. The size will be similar to the existing 16/2.8. Price will be around CNY 500 (around 80 USD).