So now we know why there were never any expansions to Shadow War: Armageddon. Games Workshop saw the clear fan interest in that game and decided to use it as the basis for a new version of Kill Team. That makes sense of course because I suspect that most people wanted to play Kill Team instead of Shadow War: Armageddon. Kill Team has more opportunity for people to use either their existing figures or buy new 40K minis. The background for Shadow War: Armageddon really made no sense when you start to toss in Necrons and Dark Eldar. Having them in Kill Team makes more sense and is thematically easier to justify.
Where I think that Kill Team really shines is how GW is packaging it. There is a core game with miniatures and terrain and what appear to be themed expansions with new terrain and figures. So the first set of expansions for the game include a Sector Mechanicus terrain pack and then two sets of miniatures that include more terrain from the same sector. The Orks team set includes Galvanic Servohaulers and the Space Wolf team includes more Sector Mechanicus terrain. The company rewards you for purchasing all of the expansions by making your initial purchase of the Sector Mechanicus Killzone package more valuable by adding to it with each of the Kill Team packs. Sure they could have included all of the terrain in one pack but that would have increased the base cost and probably stopped people from getting it in the first place. By expanding the terrain across all the products in that series it decreases the initial outlay required and creates a reward for playing who buy in to all the products in that series.
It will be interesting to see how the market reacts to this new game. I won’t be participating since I am investing most of my free time and money into AoS but this has the potential to be even more successful for GW than Shadespire