Rivalries, Lore, etc.
Rivalries are a big part of LoL Lore and will always be even with the retcon, they are visible in either the stories of champions and give salt to the game with peculiar VOs associated to them. Then I'm asking you, Riot guys, to take a look at some of them and work on them to make them feel more real!
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We have this awesome tech-war where the ideals of improving mankind and fighting for it that now has only 1 front ingame: We only have Viktor building Battlecasts to add numbers to his army while Jayce is probably still enjoying his Debonair time at the Casino with Ez and Vi... One easy thing would be to give merit to Jayce for the Pulsefire/Neon Strike and so on features or either making something new.
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Demigods fighting over an entire world (or even Universe). I know that their longer Lores are being rewritten now after the delusion of Shurima event. Some news on the development would be welcome though.
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Sion VOs showed some new interaction between the two of them... It would be really cool to develop the fight of the Demacian and Noxian Golems.
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If it's still true the sacrifice of Kassa'a daughter then there is space to build up something.