Yeah, they were going pretty strong with a ton of awesome lore there for a while. Piltover with Camille, Zaun with Warwick, Demacia with Galio, and then the Vastaya with Xayah and Rakan was epic and I was like oh man which area is next... and then nothing happened. Urgot's lore didn't touch on Noxus as much and Kayn didn't either. Ornn is extremely powerful and kind of separate from any champs besides Voli so it makes sense, but really. We really really really need lore for the areas that haven't gotten any yet, which include.
1- The Void
2- Ionia proper
3- Bandle City
4- Noxus
5- Frejlord, now this one is interesting because they did a massive lore dump pretty close to when they said old lore is no longer canon. I think that while it is no longer canon, this area and the characters in it will basically not change from the old lore, but details will be different. It just kinda needs a touch up and some new stories honestly.
And those are just the major areas that haven't gotten any love, tons of individual champions or super small groups need some lore too. I really hope that by the end of 2018, every champion that isn't about to be reworked is going to have some form of substantial canonical lore in place. It won't happen, but I can hope lol.