I'm probably late to the party here, but I think it would be good to mention the impact of mentioning the language being C++ on the box.
C++ has a long history and is probably the most heard of language in the world (I don't think Java has quite managed to eclipse it). As a side effect it has many connotations from inside and outside the programming world. Some are negative, in that it's a hard language and only "pro hackers" users, which might put some users off. On the other hand, some users would definately be drawn in by the promise that they would be using the language that "pro hackers" use.
I think the text on the box needs to be carefully chosen to encourage people that whilst it is a powerful language, it is not necissarily hard (which is sort of a lie-to-children since it is hard to use correctly, but not to use naively). To quote Stroustrup "C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg".
(Besides, we all know that C++ is not the most hardcore language out there and that real programmers use butterflies.)