I cannot vouch for these one way or the other but in case you're interested here they are (some seem a bit far fetched to me) :-
Army
• The entire army benefits and suffers from all the special rules for the Undead.
• Vampires are more than just a character choice. Blood Knights, Black Coaches and the Varghulf are all Vampires and allow Undead within 6” to March move, reinforcing the sense of the Vampire Counts army.
Corpse Cart
• All friendly units within 6” can benefit from the Always Strike First rule
• Can be upgraded to incur a -1 casting penalty on enemy Wizards within 24”, or to add 1 to the number of wounds healed by an Invocation of Nehek spell on a unit within 6”.
• Corpse Carts are a Core unit.
Blood Knights
• Ultimate shock heavy cavalry that will give Khorne Chosen Knights a run for their money: frenzied Vampire knights with three Strength 7 attacks each on the charge
• Vampire special rule allows units within 6” to March.
Varghulf
• Bestial vampiric lone monster – impressive profile with Regeneration, causes Terror and subject to Hatred of everything!
• Vampire special rule allows units within 6” to March
Mannfred von Carstein
• At his most powerful, Mannfred knows all the Necromantic spells and all those from the Lore of Death
• Mounted on a Nightmare, can be used to represent Mannfred the Acolyte or Mannfred Count of Sylvania
Vlad von Carstein
• Powerful warrior and wizard, and almost unkillable with the Carstein Ring (4+ Ward save and returned to life after death on a 2+)
• Will go berserk if Isabella von Carstein is killed Konrad von Carstein:
• Most powerful Hero level warrior-Vampire in the army list
• Hates everything, and stands a chance of succumbing to either Frenzy or Stupidity each turn.