Oh yeah, I had forgotten about that series. It was a follow-up to "War of the Spider Queen" and I conflated the two in my memory. Thanks!
If I remember correctly, the trilogy made significant changes to the Realms as a part of the game's transition to 4E. While that was irritating, I remember enjoying the story! At the end some of the drow were restored to being dark-skinned but not drow, as they were before Lolth's corruption. Whatever happened to these non-drow dark elves? Do they still exist in the Realms?
No, they haven't been mentioned. Eilistraee has returned to life after the Sundering, and she is her normal drow self, with drow followers. Her main focus, according to Ed Greenwood's Death Masks, seems now to be helping her people building stronger relationships with humans (starting from Waterdeep). And it is better that way, because
1)It makes sense. The transformed drow were only a few hundreds, like 10% of the total number of followers of Eilistraee ( a few thousands)--even tho the mage's original intent was to transform them all. They were scattered across Faerun, many died in the Underdark, more died with the Spellplague. With most of Eilistraee's followers remaining drow, they would probably make 0 impact (especially because they'de be virtually indistinguishable from wood elves).
2)Eilistraee doesn't care about the curse. In her lore that has never been mentioned, not once. In her teachings," redemption" (intended like that) never appears, not even once. She has a positive attitude, as she just wants the drow to rediscover the joy of life that they were denied, and forge their own path in life, in harmony with other races and among each other. The "curse" is now part of who the drow are, and Eilistraee acts as a mother goddess to the *drow* as a whole race, to help them flourish again, not force them to change their race. What was associated with her in LP has absolutely nothing to do with her concept. In fact, it conflicts and diminishes with what the character is about. If she wanted to remove the curse, she'd just have worked towards it. She never made a move, she has never cared. In over 10k+ in-universe years (and 20+ years of existing in the published Realms), she never nudged any of her followers towards it, she never spoke about that (except in that one single novel that concluded the series); she instead taught her followers to embrace life, acceptance, and freedom of expression. And rightfully so, because when you are born as a drow, why would you be forced to give up on who you are? Within the context of the novels, this transformation tried to turn Eilistraee's goal, which is a beautful concept, into "redeem yourself for being born as drow", which is just wrong and a copy of religious concepts like the Original Sin.
If we think about it, considering the events in the novels, that "uncursing" was actually a violence, and carried really ugly implications. Basically, those who underwent the transformation were *forced* to do so (the casters themselves are shown to be horrified). They were forced to give up the bodies they were born with, what they were, and the reason for that was that it was the only condition on which Corellon would give them access to Arvandor (which they already had, since Eilistraee's Realm is in Arvandor) and the elves would accept them. Basically, it showed them that their choice in life didn't matter, to be accepted they had to give up part of their identity. And the author/editor tried to pass this--changing the skin of a few of her followers, while abandoning the rest of the drow (the very people whose battle, *curse*, and suffering Eilistraee chose to share, starting since when she was but a "girl", just to bring them her hope in times when they would need her) to their fate--as her goal, which is infinitely far from it. And on top of that, it was because "lol, the rest is unwilling and unreedemable" which again makes 0 sense, given that most of Eilistraee's followers came from the group of drow that was labeled as "unwilling". Talk about trashing a character... I'm really glad that this was retconned away for all practical purposes.