via an anonymous source on Faeit 212
This is from the November White Dwarf, Clan Raukaan is an Iron Hands codex supplement set for digital release in November. Here are some of the details mentioned
-Iron Hands companies are named after the clans of Medusa, and Clan Raukaan is the largest of these.
-Battles vs chapters arch rival- The Slaanesh Prince the Saphire King
-Rules for fielding Clan Raukaan including the standard;
Stratagems for Planetstrike, Cities of Death
Altar of War
Kardan Stronos is also mentioned as the Iron Father of Clan Raukaan, but might just be part of the background.