Pfizer (among others) is gearing up to build an omicron-specific booster, but they don’t know if it’ll be needed yet.
What I find most interesting:
They developed vaccines for both beta and delta, but shelved them when beta failed to gain traction and the original vaccine turned out to be able to handle delta.
https://www.businessinsider.com/pfizer-chief-scientist-interview-omicrons-threat-to-vaccines-2021-11