Two articles, one source :
"Nikon press conference 14 april
'There are indications that there are new spejlrefleks'på way from Nikon on 14 April. At least for Nikon in the invitations that they have new products that will make the Danes even better photographers."
I got another tip for April 16th as a potential release date, but this is Thursday which is unusual day for an announcement.