My understanding of the mRNA vaccine candidates (of which Pfizer's is one) is they are known to be stable at super low temperatures and thus that is how they are currently being managed, but that tests for stability at less low temperatures will eventually be run and it's likely that the final safe storage requirements will be less demanding, possibly even ending up at simple refrigeration levels (although that can't be counted on).
Also, since the Pfizer mRNA candidate does the same thing as the other mRNA candidates (something something spike protein mumble mumble), then Pfizer's apparent success is a likely indicator of success in the other mRNA candidates too.
Also also, I think I understood this. We're supposed to make a difference between SARS-CoV-2 and COVID-19, the former being the virus, the latter being the cluster of disease effects produced by the virus. The vaccines - all of them, as far as I know - are being built to prevent serious COVID-19 arising after infection by SARS-CoV-2. That's to say, the vaccines do not stop infection, but they do stop the disease. If I understand correctly, supposing the vaccine works for you, you can still get a "bad cold", but you don't or hopefully won't get the covid.
And assuming the vaccine is coming along as quickly as Pfizer's results suggest, then probably by middle of next year we'll all be getting or have had the two jabs.
/is what I understand from bits of news I've read today.