Purely academic, I know, but m-w doesn't know "updated" as an adjective. To the best of my knowledge, "the list is now updated" is slang. Am I wrong here? From the Cambridge Advanced Learner's Dictionary
update verb [T] 1 to make something more modern or suitable for use now by adding new information or changing its design: an updated version of the software
http://dictionary.cambridge.org/define.asp?key=87314&dict=CALD
It definitely isn't slang.