I never played in the setting, but I remember the Dragonlance short story that was published in Dragon Magazine. I don't remember if more than one were published but I remember really enjoying what I read.
Dragonlance is sort of like "themed vanilla fantasy" - or vanilla with flakes of vanilla bean. One of my favorite setting types. Meaning, you still get the "homey" feel of traditional vanilla fantasy, but isn't just a re-hash of the same old Earth analogues, from Earth pantheons to fantasy Europe, Egypt, etc.
Also, love the Irda. I don't figure they'd show up in this product, though.
What I liked the most was the art, and as a close second the fact that we had a real adventurer's party having a long term saga well described and well built. From the trailer, I'm not sure how much we'll get from this...
The characters, the art (it is curious, because today it is retro or vintage for they eyes of the last generations), and some stories. 'Wanna Bet?' should be adapted to animation. The perfect parody of D&D, it would be loved even by people who hate fantasy. Maybe the story could start with kender telling their children the time she was with Caramon's children and these were telling their experencie with Dougan Redhammer. This could explain some changes of the details.
It's the closest D&D really has gotten to D&D Lord of the Rings without it being Lord of the Rings.
You had it all there, the Dark Queen (Dark Lord), the servants of the Dark Queen such as the Dragonlords (aka...Ring Wraiths and other leaders), the Solamnic Knights (aka...Gondor), the party (aka...fellowship) which breaks and separates and goes on their separate adventures, Helm's Deep...I mean the High Clerist Tower, etc...etc...etc.
If one wanted D&D with High Epic Fantasy, Dragonlance was the defining item for awhile....and for some, it still is.
I just remembered that I bought Dragon of Autumn's whatever (?) maybe one week after giving up on Lord of the Rings when I was 12 y.o. To me the general idea is similar: collapsed societies, active war against an Evil (capital letter) army, low-ish magic characters but high magic world.
I guess what I love about it the the cheap and easy access to D&D fantasy.