There appears to be no-one from either series in the cast however I would imagine there will be cameo apperances by various cast members of both other series So far we know that Richard Dean Anderson, Amanda Tapping, Michael Shanks and Gary Jones will make a guest appearences. Also lot of SG-1 and Atlantis minor cast members will make a crossover (as a different character).
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.