I don't see why they need to make any figures for beasts/masters.
Beastmasters = Hellions
Razorwing = lotR bat swarms
Clawed fiend = number of different figures will work for this btwn WH and LotR, I uesd an old citidal beast figure but want to do a Vampire Counts Varghulf in the future.
Khymeara = again any # of different figures can be used from all 3 lines (40K, WH, LotR) - I happen to use goblin spider riders w/o the goblins.
Let's remember that Jes Goodwin has said that around 90% of the Dark Eldar Codex will have new miniatures to go with the stats. So Scourges, Beastmasters, the Talos and Cronos and no doubt the fliers will certainly have models. I'm thinking perhaps the court of the Archon and some of the named characters may be without models.