User blog comment:TheBlueRogue/E3 2013: Ask your questions about Assassin's Creed IV: Black Flag/@comment-4829046-20130611024208/@comment-5019018-20130611192033

"I'm guessing lack of hud is there because new one wasn't designed yet"

Nope, another video showed the HUD. The map was similar, but darker, and the health bar is back at the top again.