It looked to me as if GW are finally planning to get rid of Battalions, given that there were far more Battalions for 1st and 2nd Editions with each race having their own bespoke battalions, whereas in 3rd the only Battalions are generic ones from the rulebook. I've never liked formations of any kind personally, they force players to use specific units in order to remain 'meta', rather than letting them choose their own forces to achieve a good synergy. I certainly hope they ultimately ditch them when 4th inevitably shows up next year, because choosing an AoS army list is getting more and more bureaucratic as it is, with all these pointless 'Triumphs' and 'Grand Strategies' flying around.
2nd Edition got the balance right between complexity and speed of set up and play, while very late 2nd/3rd has bulked the game out in a lot of wrong ways. I hope they roll back on this in 4th.