You realise this Death Note One Shot is for Japan ONLY at the moment. I doubt it will be any good anything, Its milked to death now. It should stay quiet. The only reason to check it out would only be to see Obata's uber 1337 pwning drawing skills.
You'll probably have to wait some time for Shonen JUMP US to release this one. Novels and Volume 13 come out this month though, Go get them instead.
EDIT: I noticed you were looking for Weekly Shonen JUMP as in straight from Japan over the Monthly Shonen JUMP that the US gets. Your best bet off getting it over here is in a Japanese bookstore.