If Sona does indeed get the Ultimate skin, she'll probably get these "buffs":

Patch Notes:

"The Maven could use a bit of love, so we're buffing her strengths while enhancing her weaknesses to keep her from being oppressive again."

Aria of Perseverance:

HEAL: 31 / 51 / 71 / 91 / 111 from 30 / 50 / 70 / 90 / 110

Base Movement speed: 320 down from 325

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Hey Sona, let's race!