Regarding the upcoming Vayne lore and some things left unfinished from the Journal of Justice
It's of course her involvement in the Black Rose, which was hinted at in the latter chapters of the Journal.
I feel like there isn't even any point to listing why continuing this storyline can lead to so many good subplots. It will make her so much cooler than the rich white Lucian she is sometimes thought to be. A player on a global scale, whose plans extend throughout the continent - Demacia doesn't really have anyone like that. She can show both the darker side of her faction and a deeper level of it.
Judging by her related champions -
and
- she's onto something so hard it will be a sin not to write about it. The Journal also implied a link with
.
P S I have a deep, dark desire for a short cameo from a certain pale gentleman, but this is left to the writers to decide.
against
as the most obvious clash of the two nations, both being public figures that represent their nations as their "Posterboys", yet there's much more to Noxus and Demacia's relationship then battling each other on the fields of war.