Graylo at Gray Matter takes a look at the new idol available to Balance Druids from Ulduar-25, the Kologarn drop Idol of the Crying Wind. After running the math on its stats versus the Balance idols available for badges (Idol of Steadfast Renewal and Idol of the Shooting Star), he reaches the conclusion that this new i-level 226 item is a significant DPS loss compared to its i-level 213 cousins, even if the Druid in question is using Glyph of Insect Swarm and has the 2-piece Tier 7 bonus granting 10% additional damage to Insect Swarm. While I think it's probably a damage increase on very high-mobility fights, Graylo's math is pretty damning. It's hard to argue that a Tier 8 idol providing less than a third of the damage granted by a Naxx piece represents ideal gear scaling.
Bears in Ulduar-25 are looking forward to their first upgrade since the i-level 128 (!) Idol of Terror, but I'm not too sure about other classes. Do you have some hard choices ahead of you, or do you plan on using an older piece?