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Reading this, patents do not sound like a blocker.
http://www.cyclingweekly.com/news/product-news/shimano-weve-tested-wireless-shifting-but-theres-no-demand-for-it-209021
SRAM own the patent for wireless shifting so you won't see a Shimano one anytime soon.
If anything it'll be a semi wireless like the FSA set-up.