All the restaurants listed are 1-credit restaurants. There are no two-credit restaurants at Epcot. The tier designations are not relevant to the dining plan.
We will have to wait to see if the CP dinner package includes an appetizer. The Fantasmic dinner package does, even if you are on the basic dining plan.
Because this is a package deal, which would be paid for at booking for those who are paying, WDW would either have to include an appetizer with all packages, or eliminate the appetizer from all packages. The other alternative is to move to permitting booking with cash only, not the dining plan. I doubt they will do this but there's no way to know until they can officially be booked.