Xi vs Li: Will China’s dual-leadership after the 20th Party Congress change anything?

The Communist Party of China has had 7 premiers. Li Keqiang has been overpowered by Xi Jinping and is the weakest one. However, Li recently stepped out of Xi’s shadow and has become a key figure under the media spotlight. The “Xi vs Li” discord is now more than public. A Taiwanese media outlet disclosed that Li would be promoted at the 20th Party Congress. What does China’s dual leadership mean to Chinese politics, power struggle, and China-Taiwan relations?