Well, Nanoha is equivalent of a Demon.
There have never been indications that she's a demon/devil/or otherwise in the series except for extreme displays of skill and power in As and Strikers and even then the only one who called her a demon was Vita and it was in A's....
All and all I just really hope Mosome does some justice for Madoka and allows her to be the character she was meant to be, and not just the weakling she was just seen as.
Wow, that was long! And I got burned! Hahah, yeah, but yes, that many paragraphs did me good! Didn't really think about it that much seeing as I just wrote it in.... Like, just wanted to say equivalent to devil/demons whatever... Hmm... Now that I (logically) think about it, I would really want to see how the Puella would make their comeback..
Well, since I read a Xover of Puella and Nanoha after reading this the first time, wouldn't it be safe to assume that this is a different timeline where Madoka is not a god? Well, it's a different matter if Homura is not there anymore though... No rewinding of time...