Two extra character slots meaning instead of only having the normal two you have you get four i.e. you can create four characters e.g. a klingon, starfleet engi, science or tactical. If it mean extra BO slots it would of said "includes two extra bridge officer slots on your ship instead of 3 or 4"
It meant you would have 2 extra character slots added to your account so instead of being able to only make 3 characters you would be able to make 5 characters.
There are 2 initial character slots but when you unlock the Klingons you receive a 3rd character slot.
Comments
There are 2 initial character slots but when you unlock the Klingons you receive a 3rd character slot.
When you create your character, you get two 'more' slots to create 2 more characters- thats what it means.
So 5 total characters that you can create.