Sony A mount mirrorless interchangeable lens camera

Information circulated in the web that Sony is develop an a mount mirrorless interchangeable lens camera: A bayonet APS-C models will no mirror design, but full frame will not be a mirrorless designis not clear; A bayonet APS-C and full frame models will be released in early 2014.
 
Sony A-mount mirrorless patent number is 20130113982.
 

Source: sonyalpharumors.com

Some people is curious that Sony NEX mirrorless cameras are quite receptive, why A-mount design. Here are three reasons:
1. Sony a series of camera and lens system has been well-established with a large number of users. E-mount lens in the the Sony lens group is still very limited.
2. The E-mount camera will continue to focus on the design of compact portable body.
3. The electronic viewfinder is technically superior to the optical viewfinder. Sony A-mount body will have the electronic viewfinder, which will replace the DSLR.