So THIS is really interesting to me. They are learning from other games and adding clustered instances to Lotro similar to Scarlet Monastery or Sunwell or Naxxrammus or whatever where you have progression between the clusters. They are also planning on gating the raid encounter so you have to complete the progression. If the progression isn't made impossible for mere mortals then I'm fine with this. If it near impossible except for the leet then I'm not so ok with it. I really didn't like the ridiculously hard attunement system (see Naxxrammus again) and I really did like the key system where you get a Bind on Pickup key from defeating the end boss. You could even have a key from the boss of each one to the next so you cannot skip and you'd have to Learn to Play(tm). Hopefully Lotro wont devolve into some gear based power grind like WoW though.
On the other hand, I hate to say it, but I'm bored of this system. Its a good system, but I'm bored of it. Whine(tm). :P The task force system of City of Heroes and the mission systems of some games push us to break out of the norm and do new things. I like this. I will definitely be supporting Cryptic in Champions Online for at least a couple months. Especially if its as revolutionary as City of Heroes was when it came out.
Nevertheless, this is a marked improvement from how Lotro's instances worked previously, and the three man instance sound particularly good at adding variety. Well have to see how it all plays out. The Rift was very well made so I have some reason to hope.