As I've understood it, they're just 50 AP daily quests with higher level mobs, except that there's three mobs in the first two waves.

Is that going to be meaningful at all? I don't know. Our current Gem Gacha provides us with pretty much everything we need, EXCEPT T3 Lithographs (Runes). If Ult daily quests have a high Rune droprate, then it'll be great. If not... then... well, who cares, I guess.