The planning is still in its early stages, and authorization would ultimately depend on ongoing studies establishing that a fourth dose would shore up people’s molecular defenses…

Whether the fourth booster could ultimately be the start of annual COVID vaccinations is also under consideration; no decision is final, and it could be necessary to make booster shots available earlier if a more dangerous, elusive variant were to emerge.

https://www.zerohedge.com/covid-19/fda-weighs-authorizing-second-covid-booster-jab