As of now, Xiaomi has not confirmed any details regarding the launch of the Redmi K40 series. Past reports surrounding the K40 series suggest that the vanilla model may be powered by Snapdragon 7-series chipset most probably Snapdragon 775 SoC. The higher model (Redmi K40 Pro) may be powered by the Snapdragon 875 SoC.
Qualcomm will hold an event on December 1 where the company is expected to unveil Snapdragon 875 chipset. The company may also unveil a new Snapdragon 7-series SoC. Being a close partner of Qualcomm, Xiaomi could be the first to launch a smartphone with Snapdragon 875 chipset.

Possible Redmi K40 global variant appears on EEC certification - 18