you're the one who lacks sufficent information.
1. DNF being worked on at Gearbox is my conclusion to all the stuff that happened in the last months + some confidential information I won't share here.
2. Duke Begins wasn't canceled, it was
halted. And there is some solid evidence that Gearbox continued to work on it since May last year. The second part is not solid for you though because you don't know the stuff I know.
3. the D-Day PS2 game being associated with the DNF D-Day is just a coincidence or even choosen on purpose to confuse us a bit. But its very clear that D-Day should refer to D-Day June 6. The "D" means "Duke" of course.
Btw I don't see any WW2 assets in the D-Day pic..or did they had futuristic armor and weapons and modern stadiums back then in WW2 ?!

Scott surely used the D-Day tag to hide the fact its DNF from the lawyers and also to prepare us for June 6.