Here's some evidence: "Apple R&D spending hit $8.1B in 2015, suggests continued work on massive project" http://appleinsider.com/articles/15/10/28/apple-rd-spen

Here's some evidence: "Apple R&D spending hit $8.1B in 2015, suggests continued work on massive project" http://appleinsider.com/articles/15/10/28/apple-rd-spending-hit-81b-in-2015-suggests-continued-work-on-massive-project http://appleinsider.com/articles/15/10/28/apple-rd-spending-...