Rift just posted this on their facebook page
http://www.gamesradar.com/rift-infernal-dawn-preview/
A comment about the Laethys fight, and it shows an awesome picture of her, with the caption "At one point this dragon turns into a giant fist and smashes the ground"a golden dragon literally made of her horde of gold, gems, and jewels. It wasn't finished yet, but we were told this encounter would function much differently than typical dragon battles, with the boss adapting her shape throughout the fight, sort of like Spider-Man's Sandman. We were told she'd fall into a puddle, reforming into different creatures to make for an interesting encounter.
Personally, I look forward to the Laethys fight of the ID raid (even though I doubt I will ever experience it). Laethys just looks damn awesome.