Despite improving there are still a lot of characters as well as a few units that GW have yet to release models for. So out of curiosity, what would you like to see released yet? Try and limit your list to half a dozen entries, no criticism of others choices, no pointing out GW won't do it for whatever reason etc.
My list:
Inquisitor Valeria, because we need a good female Inquisitor model. Plus she's bad arse.
Voidraven, 'cos Dark Eldar need their second flyer
Lady Malys, as she too is a bad arse.
Eldar Jetbikes, because eighteen years is just too long for a plastic kit.