Ok, apparently I am late finding out, since apparently the cuts for the final ballot were made in Apr and I never saw it...
but the final voting ended July 31, and I went to the Hugo site to see when the winners would be announced. Lo and behold I look at the voting ballot, and Children of Earth was not on it.
Apparently, CoE didn't qualify for dramatic presentation short form, but had to go in for long form, and that put it up against the regular motion pictures. It didn't get enough votes to make the cut for the final ballot.
And here I thought it would be under short form as the rest of the tv shows, and be a solid lock to win it. Now to find out it's not even in contention at all?
In case anyone was interested-
Planet of the Dead
Waters of Mars
'Epitaph 1'- Dollhouse
'No More Good Days'- Flash Forward
So much for me caring for the results this year.