Well, it's EU4.
I'm disappointed, to be honest. I would have much preferred Rome 2. EU was already a very good, complete game in its third incarnation and with all the expansions that one had. Rome, by contrast, felt like a somewhat incomplete game that did not fulfil its potential.
That said, EU is their cash cow, so I suppose the decision makes sense from a business perspective. Congratulations to the EU fans, who will be looking forward to number 4. As for me, I am not sure whether I will be buying it. If it turns out superb, I might. But the time period isn't necessarily my favourite.