there was a huge thread on the soe forums about ldons and this expansion. soe SPECIFICALLY said they are not going to support level 85 ldons. you HAVE to shroud if you're that level, OR get your group average lower than that, alrhough, by how much, i don't know.
there's really only two reasons to do ldons at level 85: max out the augment (there's better charm augs out there by now) and for the paladin and rogue epic quests. maybe SoE will make an exception for ldon raids, but for groups, what's the point ? the monsters max out at level 70, it would be completely trivial even for a group of 3. heck, a level 85 enchanter could tank a level 65 ldon, solo, and do just fine.
and for those people who say that they want to do the content anyways with their friends.. well Crushbone is still around, The Warrens are still there, Crystal Caverns are still around but are you shrouding and playing in those zones ? with level 85 mains ? i doubt it. if you were serious about ldons you'd have a level 65 alt that did them predominantly.
besides, now that ldon spells can be researched - and are so quickly replaced given that level 75 and 80 are so highly sought after by every singly player - there's barely even a point in buying the last remaining thing worth getting.