Sona PBE changes sum up

Passive: Has remained untouched Hymn of Valor (Q) Cooldown increased to 10 from 8 Active Damage lowered to 40/70/100/130/160 from 40/80/120/160/200 Aura range increased to 400 from 350 Proc Damage increased to 20/35/50/65/80 from 20/30/40/50/60 Less Damage out put from the 2 shots she fires out from activating the skill, The Aura Size increase allows for her to tag more teammates with the Auto attack Buff. The proc damage going up allows her to out put more damage through her teammates Aria of Perseverance (W) Heal lowered to 40/50/60/70/80 from 30/50/70/90/110 Aura Range increased to 400 from 350 Shield changed to 30/55/80/105/130 from 35/55/75/95/115 No longer increases healing based on target's missing health Although the heal was brought down, the late game shield was brought up. Same point with the Q, the Aura Size increase will allow her to tag more allies with this shield. The % Missing health will be missed however Song of Celerity (E) Cost decreased to 50 from 65 Self movement speed increased to 28/31/34/37/40% from 13/14/15/16/17% Aura range increased to 400 from 350 Ally movement speed increased to 12/14/16/18/20% from 10/11/12/13/14% A buff all the way around for Sona's more lacking ability, the amount of move speed you will be able to give your team will very much extremely help her. Crescendo (R) Passive effect now reduces the base cooldown of Sona's basic abilitiy by 20/40/60% instead of increasing the potency of Q/W/E This is a pretty big change to her playstyle. With it effecting the Base Cool Down of her basic abilities it will combine with normal CDR to give her ridicuously low Cool down spells With 45% CDR and you Ult at Max Rank this is the Cool Downs of your abilites: Q: 2.2 Second CD W: 2.2 Second CD E: 2.64 Second CD Bring Mana Regen items accordingly

TLDR: They are taking power out of Sona's damage and lane healing, and putting it into her Utilty and team aid. Overall a Net Buff imo

EDIT: Ricklessabandon on the Sona changes https://twitter.com/ricklessabandon/status/742866822689488896

6/15 UPDATE Several additional changes in here vs yesterday. Here's a complete change list from ricklessabandon. The below list is relative to current live values, not to the last set of changes.] Hymn of Valor (Q) Active damage changed to 40/70/100/130/160 from 40/80/120/160/200 Aura range increased to 400 from 350 Proc damage changed to 20/35/50/65/80 from 20/30/40/50/60 No longer extends aura duration by up to 2 seconds when "tagging" allies Aria of Perseverance (W) Heal increased to 40/60/80/100/120 from 30/50/70/90/110 Aura range increased to 400 from 350 Shield changed to 30/55/80/105/130 from 35/55/75/95/115 No longer increases healing based on target's missing health No longer extends aura duration by up to 2 seconds when "tagging" allies Song of Celerity (E) Cooldown increased to 16 from 12 Mana cost decreased to 40 from 65 Self movement speed increased to 22/24/26/28/30% from 13/14/15/16/17% Aura range increased to 400 from 350 Ally movement speed increased to 12/14/16/18/20% from 10/11/12/13/14% Ally movement speed duration increased to 2.5 from 1.5 No longer extends aura duration by up to 2 seconds when "tagging" allies Crescendo (R) Passive effect now reduces the base cooldown of Sona's basic abilitiy by 20/30/40% instead of increasing the potency of Q/W/E