Base AD lowered from 51.956 to 49
HP per level lowered from 78 to 70
Base HP increased from 487.04 to 500
Attack range increased from 475 to 550
Base movespeed lowered from 335 to 320
AD per level lowered from 2.95 to 2
Basic attack missile speed increased from 1200 to 1600
Seems to be a general buff, I mean, sure, she's losing AD, But at the same time, Her new passive..
Tailwind (Passive)
Movement speed lowered from 8% to 5%
"Janna always benefits from Tailwind's speed increase."
[New Effect] Additionally, Janna's basic attacks deal bonus magic damage equal to 35% of her bonus Movement Speed.
[Note: changelist states this should be 30%, but leaving it 35% as reflected in game.]
Nerf to MS, But a general buff as she now does bonus magic damage per AA. Not much, But it's still there, and will probably be noticable.
Howling Gale (Q)
mana cost lowered from 90/105/120/135/150 to 60/80/100/120/140
cooldown changed from 14/13/12/11/10 to 12 at all ranks
base range increased from 850 to 1000
bonus range per second charged lowered from 35% to 25%
[New Effect] "Howling Gale always reaches it's destination in 1.5 seconds."
This seems like an over all buff, However, The biggest "Nerf" To this is the last part, Where it'll always reach its destination in 1.5 seconds, Now, This is a bit confusing, But lets get this straight, The longer you charge it, you can get upto a 1750 unit SS, That travels that much in 1.5 seconds, Meaning it has a default missile speed of 1166.66667 U/S.. A hair slower than her current AA travel rate.
Range lowered from 600 to 550
Repertoir noted this is "from 600 (center to center) to 550 (edge to edge)"
Cooldown increased from 12 at all ranks to 15.5/14/12.5/11/9.5
Bonus movement speed lowered from 9/11/13/15/17% to 5/8/11/14/17%
This is a bit confusing as we see a HD Change, However, It seems more like an early game nerf into a late-game buff.
Eye of the Storm (E)
Cooldoown changed from 10 at all ranks to 18/16/14/12/10
Step in the right direction..
But really, Probably not all that bad.