This isn't the first time that dryadish elves have shown up in fantasy fiction or RPGs. It's among some that seem to be growing more common as the genre tries to move beyond the "(adjective) human with (facial doodad)" motifs of LotR/D&D-influenced fantasy.
Yes, but the thing is that this is also not the first time Elves have shown up in the Divinity series. They didn't have horns in Divine Divinity or Dragon Commander, and they definitely didn't look like Dryads in Dragon Commander.