Nissa got the most benefit from the recent update. Her first ability will ramp and draw a card, but previously your hand might have been clogged and you'd miss the card draw. Now, you can discard before activating the ability.
Her main ramp spell, Nissa's Pilgrimage, was given a buff. It now converts 2 gems to green and has extra toughness. So, it will often cascade you into at least +5 mana and +1 loyalty at the start of every turn.
Situational removal, such as Aerial Volley, have gotten better, because you can pitch it if there are no targets.
Nissa is weak to flyers, so her key creatures are mid-range creatures with reach. This includes Dwynen's Elite, Skysnare Spider, and Dwyen, Gilt-Leaf Daen.
I still think Mantle of Webs is too expensive for what it does, but if you think it should be in A then I still think Growth should be A too. Nissa doesn't have too much in the way of useful spells anyway.
*sigh* I am playing Jace exclusively, and would really like to get my hands on some of those S and A level cards. My pulls have completely sucked for blue so far, and I really hope they implement some kind of 'trading' scheme for all of the rares of other colours (often multiples) that I have and don't want.