Yeah, there are still those annoying questions about whether or not Java is fast enough. "Yes" we say pointing at 800 3D animated vikings running around on a lush, fully rendered tropical Island, "anything you can do in C++, you can now do in Java"
Problem is, as far as these guys are concerned, anything we can do in Java, they can do in C++. And they already know how to write games in C++, so...