What do we know about new COVID variant Omicron?

Omicron is the first new variant of concern since delta variant and is said to be more contagious. Preliminary evidence suggests that there is an increased risk of reinfection with the new COVID variant. 

source https://www.jagranjosh.com/current-affairs/what-do-we-know-about-new-covid-variant-omricon-1638002051-1