An anonymous tipster said the next Canon DSLR announcement will be in August. They think it'll be the 5D Mark III.
I asked about June, and I'm told nothing is slated for that month.
Along with the 5D3, a lens and flash announcement is said to be expected.
The NAB announcements prove the issues in Japan are not impeding product announcements for the time being. I don't see a spring announcement for the 5D Mark III as likely, though something else could be.