From The Guardian about the new variant:
Is there any difference in the symptoms people are reporting?
According to Dr Angelique Coetzee, who runs a private practice in Pretoria, South Africa, the Omicron patients she has seen have presented with relatively mild symptoms, and none of the loss of taste of smell typically associated with Covid-19. Instead, they have had reported unusual symptoms, such as intense fatigue and a high pulse rate. However, it is far too soon to know if these anecdotal reports will be true of everyone who is infected with Omicron.
How could it play out in the coming weeks?
Within the next month, we should have a far better idea of how contagious Omicron is, and whether or not it is associated with more severe disease. We should also know the extent to which it has been contained, or if it has spread more widely, as is expected by many scientists. Perhaps most important, will be the results of those ongoing experiments to test how effectively antibodies neutralise the new variant. Real-world data on reinfection rates will also give a clearer indication on the extent of any change in immunity. Until we have all of this data, it makes sense to remain cautious and reimpose some restrictions to limit Omicron’s spread.