Egami, Japanese engineer/blogger shares patents for potential wideangles for Nikon 1.
They look good, but I would rather hope that the design of 7.5/2.8 is scalable and could be applied to a successor of AF-D 20/2.8.
For 7.5mm/f2.8 and 9mm/f1.8 (published on August 24, 2015):
http://egami.blog.so-net.ne.jp/2015-09-07For another version of 9mm/1.8 (Published on March 22, 2016):
http://egami.blog.so-net.ne.jp/2016-04-01