I have been missing something from PP beta videos and I think I finally realized what: items!
Be it unique offensive or defensive granades, ammo, scanners, decoys, mines, timed explosives, grapple, jetpacks, invisibility gear, combat stims - those are things which made all of XCOMs, old and new tick.
Few of them are in game, and some we know are coming, but I do hope that there is quite a bit to come.
As it is, soldiers development feels fairly utilitarian, with couple of skills being gamebreaking, and it’s fine. Equipping them with unique gear however, granting usable abilities would make things interesting. I also feel that applying gamey restrictions (like timers or uses per mission) work better in such scenarios, as they are easier to explain in lore (recharge time or refuel).
In addition various new items could be tied to various factions, modifying playstyles available at our disposal with each playthrough, depending whom we are friendly with.