Well she been fully revealed, we won't get any gameplay of her until the next stream but so far she looks amazing. Here her text.
Furina: Endless Solo of Solitude
Regina of All Waters, Kindreds, Peoples and Laws Undoubtedly, Furina has been much loved by the people of Fontaine from the moment she became the Hydro Archon.
Her charismatic parlance, lively wit, and elegant bearing - all bear witness to her godly charms.
But perhaps the thing that she is most revered for is her unrivaled sense of drama.
As the protagonist of a famous play at the Opera
Epiclese once put it,
"Life is like the theater - you never can tell when the twist will come."
Furina is as inscrutable as the most cunning of stage characters, her course of action defying all prediction.
In fact it's precisely for this reason that the god of Justice and Judgment, unapproachable in her divine majesty, has such a bewitching influence.
But when the curtain falls, a hollow feeling invariably starts to creep in.
There are those who wonder whether there are moments in the dead of night when even a god like
Furina feels the sharp pangs of loneliness.
No, surely not. People couldn't possibly imagine, let alone believe, that such a scene might play out.
And that's indeed the way it should be.
That is, were it not for the fact that Furina's tears had already been silently washed away by the Fountain of Lucine.

Well it looks amazing in her art, the splash art is completely different from the one above that being that she have a hydro vision, her clothing is darker and her hair is short, this either could be a mistake of some sort or this is Furina alter ego, because there two people inside this archon head one that overly like a brat of sort and refuses to fight or get into a fight and the other being more of the mastermind. Tho with that being Furina is also the only one that doesn't have her hydro symbol on her art, could it be she still uses the hydro Gnosis.

Overall that my thoughts on her and her art, she fully released in version 4.2 so that a month away.