So by the look of it there are no Jackals in halo wars 2, which doesnt make much sense since a large chunk of the population are either mercs/pirates, which makes me think if the jackals are like this, why where some not recruited by the banished in HW2 it honestly makes little sense.
But it got me thinking maybe they could be added in a DLC in the future, since it looks like they are adding in a new leader every month as DLC, it would be quite surpprising if they didnt, since they are the only covenant race in the series which have not been added in.
Although i can imagine the faction using a mix of both tech from both the Human and the covenant which would be quite cool to use, but we will have to see in the future if they do or do not add them in