According to an official announcement, the site will produce the third-generation V3 Superchargers (currently with a power output of up to 250 kW).
The plant will be capable of producing up to around 10,000 Superchargers annually, which would be enough for about 1,000 new stations (assuming 10 stalls per station on average and the power electronics).
Currently, there are more than 730 Supercharging stations in China, covering more than 300 cities.
As of the end of the fourth quarter, Tesla installed over 2,500 Supercharging stations, including 383 installed in Q4. With the new factory, it should be possible to add at least 1,500-2,000 more a year (15,000-20,000 individual stalls).
Since we don't see such a big push from the rest of the automotive industry, Tesla's fast-charging infrastructure probably will remain at the forefront.