I'm looking at the math here wrath and I don't see anything free... $10 Diplomacy + $30 Discount Rebellion = $40
While Full price Rebellion which includes Diplomacy =$40
Yeah, but if he gets Diplomacy now he can play it now, while if he doesn't he still pays $40 and is stuck with Entrenchment until the Beta, which may not be that fun, so he may choose to wait until the full release. So if you get Diplomacy and preorder before the end of the month its a better deal.