So far, only the printed version is official, and
for the medium term, ... the paper version [will be kept]The legality of the electronic version will be allowed by an official electronic signature that, according to the same EC document, will be available before mid-2009.
along with the electronic version as media having legal value.
But maybe Ralf Grahn could also comment on this issue?!
(update) -> And indeed, here is Ralf's reaction. Thank you, Ralf!