im sorry to dissapoint all u voldy fans out there but no, ralph fiennes is not reprising his role or it would be in the imdb cast list of half blood prince and he aint there. and if he is which i doubt, he,s only be doing the memory scene where he asks dumbledore for a job and dumbledore says no and i know they cut that memory. so don,t know where there getting there info from but its all specualation