The Ghoul king mount thing. It's worth some more points than a Varghulf. It can be included as a mount for a ghoul king (wich is any vampire lord with the ghoulkin vampiric power) or as a RARE UNIT.
It flies, causes terror, is large target, undead. I think it is WS3 or 5, not sure on that. S5, T6, W6, I3, A4, L??.
It has a shooting attack similar to the banshee. Roll 2d6 + number of wounds remaining of the monster - Leadership of the target unit = No armour saves allowed wounds. Not sure on the range. I think it was 18". Probably less.
Can be upgraded with poisoned attacks and/or a special rule that inflicts 3d6 S2 hits on any BtB unit when it dies.
The wraiths become a hero choice, and it seems they can join units. They are the same stats as in the VC book, and can make an special attack, replacing its normal attacks. This special attack auto-wounds and doesn't allow armour saves. The model is plastic and has 3 different heads. It's like levitating, with a cloak and a scythe.
The banshees become a hero choice (not sure if they can join units). Not new rules. The model is great. Also levitating.
It isn't specified if the wraiths rare unit of the VC book is still usable.