Differences from normal
-more HP, hits harder
-nest platforms are extremely important to execute properly
-nests 4, 8, 10, and 12 have Guardians that require a tank
-very high tank damage
-feather uses reduced from 4 to 3
There are multiple ways to divide up your raid, but you must take care of ten nests. For our group, one team took care of all the guardian nests while me and a Boomkin took care of Nests 3, 5, and 6. Once you have your teams set up appropriately, execution isn't far from normal.
Nest 1 - lower - Team A (acquire feather, use 1, 2 charges remain)
Nest 2 - lower - Team A + Tank (use 1, 1 charge remains, try to fly up during Feed Young to pick up Primal Nutriment)
Nest 3 - lower - Team B (acquire feather, use 1, 2 charges remain)
Nest 4 - upper - Team A + Tank (use 1, 0 charges remain)
Nest 5 - upper - Team B (use 1, 1 charge remains)
Nest 6 - upper - Team B (use 1, 0 charges remain)
Nest 7 - lower - Team A (acquire feather, use 1, 2 charges remain)
Nest 8 - lower - Team A + Tank (use 1, 1 charge remains)
Nest 9&10 - lower (Team B ) and upper (Team A + Tank)
Nest 11 - upper - Team B
Nest 12 - upper - Guardian (ignore)
Our group had sufficient DPS to stop after 8 nests, pop Bloodlust, and burn. Our DPS is quite gifted, however, so I'd recommend handling at least through Nest 11. If you ignore 9 & 10, Team B can go down on 9, nuke nests, pick up a feather, and chain Primal Nutrient for rest of fight. Team A should have 1 charge left to get Primal Nutrient. Fight is an easy DPS race at that point.
Quills hits REALLY hard in heroic mode. Line up defensive CDs and ensure that no one gets pushed off during Downdraft. Quills is on a 60 sec CD, so you can alternate 2 min and 3 min CDs as well as personals. Use Stampeding Roar and other personal movement increasing abilities during Downdraft.
DPS Concerns: Primal Nutrient is very important for Team A. Team A will be using feathers to get Primal Nutrient buff and fly to nests and wreck them. One or two of your DPS needs to focus on getting the Primal Nutriet to blow up Ji'kun. Primal Nutriet is a 100% damage buff and 40% healing buff. Other than taking care of each nest, make sure you put as much DPS into Ji'kun as possible.
Healing Concerns: Quills hurts like crazy. You're looking at some 500k damage to each player in a short window. Plan your non-stacking healing CDs appropriately, because stacking on this fight is difficult to do with Caw happening all the time. Aside from that, tanks will be getting reamed. Talon Rake is the ability to watch for.
Difficulty: not so much. Rather accessible Heroic if you can get Ji'Kun to about 25% when you are done with Nest 8.