From Ask Riot: Victorious Champions;
Q: What method or criteria do you use to choose which champion gets the Victorious skin each year?
A: We start looking at options for the Victorious Skin in the Spring. Making any skin takes time, but the Victorious Skin is also teased one month before it’s released. With this in mind, we need to plan ahead for the Victorious skin, especially in comparison to a normal skin.
To begin, we take a look at champions that had a big competitive impact so far that year—this is largely based on Ranked and Pro play. Once we have some ideas for potential champions, we narrow down that list by eliminating champions who:
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Already have a Victorious, Championship, or Conqueror skin. We wouldn’t do Conqueror and Victorious Karma in the same year, or Victorious Elise 2.0.
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Play the same role as a recent Victorious Skin. Since we had a top laner last season, we tried to avoid picking a top laner again this year.
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Have another skin coming out soon. We try to spread out skin content across our whole champion pool rather than drop a bunch of skins for one champ at the same time.
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Have a very small number of skins. Since the Victorious Skin can’t be attained by everyone, we don’t want that to feel like the only skin your favorite champ gets.
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Have a big balance change incoming. This is definitely the hardest criteria to figure out because balance can be fluid and we’re trying to predict the state of the game six months or so in advance.
After running through that list of criteria, we came down to Graves. As one of the stronger junglers at the time, he was towards the top of the list for both Pro and Ranked play. He’d never been featured in one of our competitive skin lines, wasn’t primarily a top laner, didn’t have a skin planned, and already had several skins available. As it turns out, he did receive some substantial balance changes, but those came after work on the skin had already begun.
So, Camille would only fit into 1, 3, and 5 - she doesn't already have a Victorious/Championship/Conquerer skin, doesn't seem to have another skin coming soon, and she also doesn't seem to have any big balance changes on the horizon.
But, she does fit into similar roles as the last two Victorious skins (Graves - Jungle, Maokai - Top), putting some unwanted overlap there. And, of course, she only has one skin at present: Program.
All said, I think Camille's ineligible for a Victorious skin. I think it'd be better to look at Supports, Midlaners, or Bottom Laners for potential Victorious candidates - Supports or Midlaners being the most likely, since Victorious Sivir came before Maokai.
( 
What if they gave us a double victorious skin in these twos' honor =O)
