Silverwook wrote: There's also this...

I'll take your '7TH APRIL 82' and raise you a '17TH FEBRUARY 82':

From the General Madine Deleted Scene on the 2011 set.

*EDIT*

As they already had the Blue Harvest title floating around, having a different title during production from the final film added a second layer towards obfuscating their work. If a leak happened and it was attributed towards, Revenge, they could know it was person on set. Probably only about 4-7 months before premiere would they have needed to alert all the toy and book companies involved of the final title.