Buffs:

Move Speed: 315 >>> 330

AD: 46+1.5/lvl >>> 52+3/lvl

Howling Gale (Q
Mana Cost: 60-140 >>> 60-100
Min Range: 1000 >>> 1100
Max Range: 1750 >>> 1760
Travel Time: 1.5s >>> 1.25s
Possible added Team Indicator showing team where Q will go.

Nerfs:

Attack Range: 550 <<< 500

Tailwind (Passive)
Janna Gains 8% Move Speed <<< Janna Gains 8% Move Speed while moving towards allies
Janna's attacks and W no-longer deal bonus Magic Damage based on additional Move Speed

Adjustments:

Zephyr (W)
Range: 550(Edge to Edge) >>> 650(Centre to Centre)
Slow Duration: 2s >>> 3s
Cooldown: 8s-6s <<< 12s
Damage: 55-175 >>> 70-190
Passive Move Speed: 6%-10% >>> 8%-12%

Eye of the Storm (E)
Cooldown: 16-12 >>> 15-9
Time before Shield decays: 0.75s >>>1.25s
Shield amount: 80-220+0.7AP <<< 80-200+0.65AP

Monsoon (R)
Healing Tick Rate: 0.5 <<< 0.25

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Q is way stronger and faster, use Glacial Augment to walk up and get a W off.

Healing is more viable, you can go Moonstone Renewer, and it combos very well with the new E (Impairing an enemy champion’s movement grants 20% heal and shield power for 5 seconds)

What Runes To Go?

Aery - Trading lanes against other enchanters like Lulu or Nami

Glacial - Against teams with high movement speed or if your teammates can capitalize on slows

Guardian - All-in champions such as Leona, Nautilus, and Rell.