Apple has just been granted a total of 12 design patents by the Hong Kong Patent and Trademark Office. The bulk of those cover features from the iPad Pro, namely Split View and Slide Over multitasking functionality. A single one of the 12 patents is related to the iPhone 6s - 3D Touch. Apple filed for the patents all the way back in December last year - several months before the iPad Pro was made official. Mind you, the scope of the patents covers the design of the features - it doesn't mean that other manufacturers can't make their own multi-window or 3D Touch-like...
Source: http://www.gsmarena.com/apple_patents_split_view_slide_over_and_3d_touch_features-news-19178.php
