here's the thing.
this absolutely needs to be covered by the season pass.
take what bethesda did with Fallout 4 as an example. the season pass for that started at around $20-$30. i don't remember which. however, after they announced the first actual expansion DLC, they raised the price of the season pass.
this is what 343i needs to do instead of making us purchase this additional content. raise the price of the season pass. make it $40 now instead of $20, and have the existing season pass holders grandfathered in for this expansion.
otherwise...this is a complete joke and i don't see very many people actually purchasing this. as it is now, you can't tell us that campaign missions are covered in the season pass, then announce that we have to actually pay more for them. they said it's only a 2 mission "mini" campaign for that, but what does that even mean, exactly? you can't go on to announce a whole new campaign and then ignore everything about what the season pass missions are. we don't know anything about them except that they're calling it "operation spearhead". that's it. instead of giving those to us, or even any information about it, they just seemed to...ignore it, stay quiet about it whenever anyone asks, and then just went ahead and announced some campaign missions that have nothing to do with this.
that's not a good business practice. that's not good for the community, that's...343i, you're already on thin ice with Halo MCC and Halo 5, now you want the remaining fanbase to be even more pissed off at you?
why? give us an actual incentive to keep playing, give us an actual incentive to the season pass. of all the leaders released thus far, only one of them has been decent for the current meta. so we payed $20 for a $5 leader? we haven't even gotten more maps. at this point, we have more leaders than maps. the original halo wars has more maps than what you provided us, and they were actually fun instead of the same map just with a different skin. now you're telling us to get more maps, something that the season pass was supposed to cover, by the way, we have to pay you even more money? give us actual information about things on an actual timely manner. be upfront with what you are doing and stop alienating your entire fanbase.