Yes, the next and final step toward acceptance is the interview. Generally there is a 10:1 ratio of applicants to spots but once you get the interview the ratio is now 2:1. Check pharmcas for exact figures, which depends on schools for example: midwestern CCP interviews 500 and accepts 250.
Remember also that just because you have an interview doesnt mean an acceptance. Imagine now you have applied to a dozen schools and 5 call you for an interview. Now take out 5 quarters. each quarter represents one school. Flip each one. The ones landing heads are acceptances and the ones with tails are rejections. Some people get very lucky and get all 5 acceptances, some get 2 or 3, and some get 1, and some very unlucky few get 0 heads. I suggest you flip your coins wisely.