You will be required to report to immigration whenever you spend 90 consecutive days in Thailand, say if you never leave Thailand for 10 years you will need to report every 90 days just because you are on a Non O visa based on marriage to a Thai National you are not exempt from reporting.
Impossible to answer that in January, you will have to check that closer to your travel date, but at this stage there hasn’t been any date fixed for the implementation of the ETA.