There is lots of expectation that we will see the successor of Canon EF 14mm f/2.8L II USM lens in near future which is confirmed by the latest information about the patent filed by Canon for Canon EF 10mm of focal length and aperture of 2.8 , f/2.8L ultra-wide angle Prime lens . It will be definitely the widest prime lens for Canon full frame DSLR camera and will take place of Canon EF 14mm f/2.8L II USM lens.
We have not much information about it but due to the presence of Ultra-Wide Angle Prime Lens, it will be superior for architectural, wedding, or other pro-level photography applications and it will also a weather –shield.
Patent Publication No. 2015-102620 (Google Translated)
Filing date 2013.11.22
Focal length f = 10.30mm
Half angle of view ω = 64.54 °
Image height 21.64mm
Lens length 124.58mm
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