On the technical/software side I've heard the project uses C++ and not Ada like the F-22 does/did. {I'm unclear as to whether the F-22 transitioned to C++ or not; I seem to remember an article talking about it because they "had difficulty" finding Ada programmers... as if the cost to training competent programers to use it was less than the cost of hiring incompetent/unwilling programmers.}
Personally I want to use a language that helps me catch stupid mistakes rather than just pass detectable mistakes into production.