Korean selection process ended.

Kang Dongyoon and Won Seongjin were selected by beating Shin Jinseo and Lee Donghoon.

Seeded; Park Junghwan, Park Younghoon, Lee Sedol, Kim Jiseok, Na Hyun

Representing China:

Fan Tingyu, Ke Jie, Shi Yue, Chen Yaoye, Gu Li, Lian Xiao, Qiu Jun, Tang Weixing, Tuo Jiaxi, Huang Yunsong, Mi Yuting

Schedule:
19-24 April - first 3 rounds
9-14 June - best-of-3 semifinals
9-12 August - first two games of best-of-5 final
22-26 October - remaining games of final

30 players in total (more than before). Fan Tingyu and Park Junghwan (top 2 last time) are in round 2 directly.

Fan tingyu got his promotion to 9d from winning this tournament at age 16 or so.

When does the cup start and where will we be able to find news about it?

You can get some info and game records for prelims here. Go Game Guru had some pretty good coverage of the last one.