User blog comment:Emptylord/Season 3 - PBE Patch Notes/@comment-79.191.107.217-20121118220914/@comment-3308937-20121119143617

It's always worked with spell vamp with Morde and Poppy's Qs, as they've always changed Lich/Sheen/Trinity's damage to magic. These abilities, however, make it part of the auto attack so I believe they'll still be the exception and it won't work with lifesteal or spell vamp.