Of course, this is also all assuming their bios don't get revamped in a few months to omit all of their detailed character interactions in favor of building more cohesive characters.
I can see it now...
Sej: "Sejuani is driven by desire to regain her former glory, while tempered by a humbling diplomatic loss to an unnamed other regent in her early years."
Ashe: "(insert as-of-yet-unheard childhood incident involving an archery training accident, skip ten years ahead to ruling freljord while her grand advisor's eyepatch is a permanent reminder to guard against hubris)"
Don't worry, though, the awesome complex political structure will be revisited when they unveil their new lore delivery methods in 2016.
Sorry, don't mean to sound too bitter, just tired of getting the runaround from the lore department on, y'know, actual lore.