Moderna and Pfizer (1) and AstraZeneca (2) are getting ready for the next round, still using their current technologies. They're not planning on going back to "classical vaccines" for COVID-19.
1) https://fortune.com/2021/11/29/covid-19-omicron-vaccine-prot...
2) https://www.independent.co.uk/news/uk/omicron-oxford-covid-a...