You asked us about adding all-in pledge as soon as it's possible, so here you are.
4 sets are blackened. Two of them are not surprise for you - we have promised you a Cossack faction so you may expect Cossack faction starter set and Cossack character set set. Remaining two will be revealed soon, we may only say that one of them wasn't planned by us at the very beginning of campaign but we decided to make it basing of feedback we have received from you.
As you requested All-in doesn't contain commoner sets (additonal janissaries, dragoons etc) to keep its price as low as possible.