After all the acceptance calls, they'll email those that have interviewed but were not accepted to say you're in the active applicant pool, which means you'll be reassessed in March/April for the last round of acceptances.
They only offer acceptances for interviews that have happened since the last round of acceptances (so those that have interviewed by next week will either be accepted next week or will have to wait until March/April for an A or WL decision - i.e. you couldn't receive an acceptance during the December calls). Hope that makes sense..