Couldn't think of a catchy title for this lookout edition (was thinking something along the lines of the Chardonnay Edition:)? to play on shards but...)
My friends and I haven't done the new instances yet, to be honest it might be a struggle to get 6 "hard core types" to do the _6_ man* instances let alone the 12 man* raid
*Using man as in this definition: one of the players on a team
Most everyone spent a few days just messing with the new relics thing, then did the new book, I had to play catchup; and did book 2 and the new book 3 in one night took less than seven hours for both books including TWO HOURS wasted on one quest because I was waiting for a visual cue that I was "satisfied"...
The lotro-wiki.com links have the bosses listed, and when clicking on the boss name you can see a screenshot of Knowledge of the Lore-master which shows you the most efficient damage type against each mob, and their mitigations.