https://arstechnica.com/science/2021/02/pfizer-vaccine-rollout-might-get-a-lot-easier-ultra-cold-storage-not-required/

Pfizer and BioNTech have done more studies and found their vaccine does NOT need to be stored nearly as cold as they initially thought: It can survive for up to TWO WEEKS at -25°C to -15°C (-13°F to 5°F) (aka standard freezer temperature), and FIVE DAYS at 2⁰C to 8⁰C (Standard fridge temperature).

They initially thought it needed -80°C and -60°C (-112°F to ‑76°F) but could take fridge temperatures for five days, and put a LOT of time and money into buying up dry ice and freezers. This will make distributing that vaccine a LOT easier and will also make the supply chains for it and the other vaccines more similar, which again, makes things easier.