The Craftworld famed for its Rangers would most likely see Pathfinders available without Illic, perhaps moved to Elite. This would allow you to field up to 90 Snipers, dominating the field with your infiltrators.
Biel - Tan
I'd like to see the previously rumoured Autarch paths in this one, along with the option of using other aspects as your compulsory troops, to better represent the Swordwind. Maybe a limit on the use of Ghost Warriors, as the fluff more dictates an Aspect army.
Ulthwé
Seer councils seem like a must, perhaps the option to upgrade your warlocks to farseers? If it's true they'll add more units in supplements, I'd personally like to see a sort of personal Vyper with a Seer as a passenger, to add some variety, although jet bikes are probably better. Black Guardians should also get full rules, instead of being represented by normal Guardians. They're a standing army, they should be trained better than normal Guardians
Saim - Hann
To make this successful, new Jetbike and Vyper kits are a must, along with new Shining Spears. It would be nice to see rules for fielding a clan leader or something, that gave a boost to nearby Jetbikes.
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Anyway, that all from me. What would you folks like/ expect to see in Craftworld Supplements, assuming they arrive?