On July 10, Foshan will begin running high-speed trains directly to Hong Kong. Similar to the announcement made yesterday about Zhaoqing, the Foshan service to Kowloon will be just one hour and 22 minutes. Second class fare is RMB225. Tickets will be available on trip.com (our recommendation).
It is not actually a new line. All that is happening is journeys previously requiring a change in Guangzhou South will now run direct, i.e., at certain times of day, trains will run all the way to and from Hong Kong.
Read more in Chinese.