A lot to digest with this mage, not sure how I feel about her just yet. She seems cool, but there are so many components to her that it's hard to see how good she will be (plus we haven't seen all of her toys yet). It looks like they are going to have to issue errata on a few cards though to work with her, someone already mentioned Tanglevine plus there is the Great Tree of Life which is not listed as a tree... Issuing those kinds of errata's are kind of messy and not good IMO because you don't want people to have to always be referring to a FAQ in order to play the game, but it would be kind of lame to NOT errata them too.
While she seems good, I do have a few caveats. I may just be a bit gun-shy from the Warlord, but all of her limitations smell of overbalance, like they were so afraid of her capabilities that they overly restricted her (just like the Warlord). Maybe that's not the case, and I'm not saying it is (yet), I'm just getting that feeling when I look her over (the limitation of level 1 Water spells screams of overbalance to me).
Another thing that I have a concern over is her spellbook building flexibility. There is already a large chunk of cards that are pretty much mandatory to include in pretty much every spellbook (Teleport, Dispel, Dissolve, Etc), but on top of that, the Druid seems like you pretty much have to build her a certain way or she won't do much. Druid spellbooks will probably all seem very similar, since they will all include many of the same attack spells, creatures and conjurations with very little variation. I'm not a fan of mages whose builds are basically predetermined (like the Forcemaster).
She also seems like she has a hard counter already in the game (like rock beating scissors) in the form of fire spells. Due to her reliance on plants, it seems like the Warlorck and/or a Fire Wizard would wreck her. But perhaps not due to regeneration and easy access to Geyser and the like, I guess we'll see.
I'm not trying to be all negative about the Druid, I think she looks fun and I'm excited to try her out, but part of me is scared that she is the worst part of the Forcemaster (predetermined path of play and little variation in spellbook design) combined with the worst part of the Warlord (overbalanced).
I hope my fears are misplaced and she's awesome with lots of varied builds available to her because I don't want another mage that sits around in my collection and only comes out when I want to play a "fun" build.