Reddit mentions of China’s Strategy in Space (SpringerBriefs in Space Development)

China's space strategy by Stacey Solomone is offers a short, sharp insight into the Chinese plans, what they have done, motivations, and the way they operate. It's quite a useful book for trying to make sense of things, though not very detailed.

Some of the main points were that, contrary to popular belief, China's aerospace industry will soon be innovating independently, rather than copying. In human spaceflight, while they have made few crewed launches (five, 6th this year), they've made big leaps between each.

Overall, China's got a load of plans, which don't receive much coverage. They are working on a number of fronts, including new rockets (Long March 5, debuting in Sep/Oct this year, will be comparable to Delta IV heavy), Earth observation, space science (dark matter probe & 3 more this year), a 60 ton, modular space station (core module scheduled to go up in 2018), lunar exploration (Chang'e-4 as you note and a sample return (Chang'e-5) in 2017) and the Beidou nav/positioning system. These amount to a huge, ambitious commitment, and it will be interesting if they can keep the pace - especially given the current economic wobbles in China.

Regarding policy and direction, in March China will announce its next five year plan (2016-2020), and we should be able to learn about (some) future plans. Following this, a new space white paper will be released near the end of the year, in which priorities will be laid out. The current, from 2011, can be found here if you're really keen. Hope that helps.