Too soon to call and we haven't seen all the spells; but there's a stronger visual cohesiveness in these magic trees, further distinguishing them. Trying to put 2 & 2 together. So far I'm seeing:
- Inferno and Winter: the obvious.
- Spirit: Cyan/teal-blue; w/ some green.
- Entropy: Purple; for the most part (lightning). Damage-dealing numbers for Stonefist: Yellow.
- Non-specific/non-elemental magic in general: Green.
- Fade/Rift: Green; brighter.
See a connection? Magic in DAI: 50 Shades of Green 
Also: Notice that pretty (bright green) Glyph on the ground, activated the moment Iron Bull steps foot on it, sending him flying? The (green) magic "pulse" the Tevinter mage boss used on Leliana during the cutscene, also tossing her away. Even the (green) portal Dorian summons? Mark or the Rift (green). Environment interaction: magically restoring a bridge; lighting a torch up... (green). Rifts & all things Fade... green!
Note on the glyph: similar, but not to be confused with the enemy portal circles, except that they're the same (bright green) color; again suggesting a connection to the Fade/Rift Magic.

I'm guessing that enemy IS a Rift mage. And fairly certain we'll be seeing at least this one glyph (Repulsion... Defiance?) and maybe some others glyphs, too; under the Rift Mage spec. Yes!!! 
Wouldn't count out other (so far, missing) fan-fave, DA signature spells such as Crushing Prison - not fitting in Spirit's "support" role - may also be a Rift Mage spell. And others like Walking Bomb being under the Necromancer spec.