I will buy it just for the shake of having the latest Duke game.
But I don't think it will be a day one purchase,and perhaps I will wait for a price drop first.
I played the demo but disappointed me instead of exciting me.
I'll wait to see some reviews to learn if some problems the demo had are fixed in the final version,and if they are and they game is better on almost everything I will buy it before price drop.If the game is as bad as the demo,then I'll wait until it's 15$ and they have released mod tools for the pc version.
If they let the game out with all those problems the demo had,THEY HAVE TO release mod tools so we can fix the game to a playable status.