User blog comment:Emptylord/Season 3 - PBE Patch Notes/@comment-79.191.107.217-20121118220914/@comment-3974211-20121119152513

Lich Bane only applies spell vamp for Poppy, Morde and Twisted Fate because it deals "bonus damage", and their abilities apply spell vamp. Now that it's a specified damage type (rather than an amplifier), it will likely not apply spell vamp for anyone. However, it's possible it still will apply spell vamp to the above champs.