About that new Champion, Yone...

I'm pretty sure the champion in the bottom picture is of Yasuo, obviously a male, and an expert swordsman (as evidenced by him balancing the seed on his sword). I'm also pretty sure he'll be released as "Yasuo, the Unsheathed Sword." But he won't be the next champion.

The next champion will likely be Yone, the narrator, who I believe will be a female, and who will most likely be a support. (Riot loves female supports, and if we look at the silhouette in the first image (may or may not be Yone), it looks very feminine.) We know this because of what she says initially about working with her brother: "The true challenge lies in teaching him not to kill." This indicates pacifism, support, healing, diffusion, etc. The other inference I draw that she'll be support is when she says "Were it not for my actions, I wonder if he would have been swept down this dark path...At first light tomorrow, I set out to capture a sword without a sheath: my brother Yasuo."

Both of the bolded parts indicate that she did not harm him or, obviously, kill him when she intervened him going down a dark path, and she isn't setting out to stop (by any means necessary, or in other words, kill,) her brother. She's out to capture him. Again, indicating a more peaceful means of stopping him, maybe even "saving" him. Peaceful means = support, at least that's what makes the most sense.

And since the story leaves with Yone setting out to capture her brother, it makes sense that we'll be following Yone's story first, not Yasuo's.