re: DFG and Ahri
I've compiled a list of net changes since V3.13, which was when the slight rework was released.
Mana increased from 230 to 250. [Regen Overhaul] Mana regen changed: 6.25 (+???) -> 7 (+???) -> 6 (+0.8)
Essence Theft Now heals 2 + (1 * level) + (9% AP) per enemy hit by the empowered ability, rather than granting 35% spell vamp.
Orb of Deception Mana cost decreased from 70 scaling up to 90 to 55 scaling up to 75. AP scaling per pass increased from 32.5% to 35%. Will now return to Ahri even if she dies or becomes untargetable before it reaches maximum range. Ahri gains Movement Speed while the orb is deployed-- a rapidly decaying speed buff at launch and then a moderate one while it is returning.
Fox-fire Enemies hit with multiple fox-fires take 30% damage from each additional fox-fire beyond the first, down from 50%. Maximum damage to a single target reduced to 64 / 104 / 144 / 184 / 224 (+64% AP) from 80 / 130 / 180 / 230 / 280 (+80% AP). Mana cost reduced to 50 from 60. Base Damage increased to 50/80/110/140/170 from 40/65/90/115/140, increasing maximum single-target damage to 80 / 128 / 176 / 224 / 272 (+64% AP).
Charm Mana cost changed to 85 from 50/65/80/95/110. Ahri deals 20% increased ability-based damage to enemies that have been Charmed in the last 6 seconds. Ability Power Ratio increased to 50% from 35%. Base damage increased to 60/90/120/150/200 (?) from 60/90/120/150/180. (Probably going to be 60/95/130/165/200 :V)
Spirit Rush Damage reduced to 70 / 110 / 150 (+30% AP) from 85 / 125 / 165 (+35% AP). Maximum damage to a single target reduced to 210 / 330 / 450 (+90% AP) from 255 / 375 / 495 (+105% AP). [Damage to Charmed enemy: 252 / 396 / 540 (+ 108% AP)] Now has a visual effect while she has charges available.
Things in italics are being removed and things in bold are being added in the PBE.
So ~15% of Fox-fire's AP scaling has been moved to Charm, the base damage against a single opponent is ever-so-slightly reduced and the damage against multiple targets slightly increased (30 at rank 5)--if we're looking it in the whole, the changes to her basic abilities still sum up to around the same damage.
So, then, can Spirit Rush receive some extra damage [to v3.12's state]? It'd be really nice to have--quite a lot of damage was lost from Charm's Doom debuff, which seems like it it will significantly harm her ability to finish off targets as a mage. ...And can Fox-fire finally be fixed so it doesn't fizzle out when you use Zhonya's Hourglass? :/
I'd like to think that my argument speaks for itself but I know that such things are never as one hopes.
And I know she doesn't, strictly, need more damage, but it would greatly assist her when/if she starts falling a bit behind if she had a little more damage available to her.