As of now, there are no established ETA requirements for January 2025 in Thailand, and any potential updates are unclear. Some comments suggest that an ETA may be considered in conjunction with a 300 baht tourist tax, which is set to be proposed to parliament in January 2025.
The ETA will be combined with the payment of 300 baht tourist tax. The proposal goes to parliament sometime in January and if passed then goes to the Royal Gazette, so at the earliest it will be February