For now you need to use 'or' clauses
var whereClause = breeze.Predicate.create("id", "==", 3)
.or("id", "==", 5)
.or("id", "==", 6);
var query = breeze.EntityQuery.from("elemnts").where(whereClause);
or ( with your list of ids):
var preds = listOfIds.map(function(id) {
return breeze.Predicate.create("id", "==", id);
})
var whereClause = Predicate.or(preds);
var query = breeze.EntityQuery.from("elemnts").where(whereClause);