This is an interesting first chapter, it's different than the usual Nanoha, but so far it doesn't seem like a bad new direction. The art is also nice.
That said, I hope Fate joins Nanoha soon in the next chapter, they both together have been part of the initial marketing, so hopefully they start flirting soon.
And yeah, Exceeds follows the "new" continuity of the movies, so this is a new timeline for NanoFate to marry and adopt Vivio all over again.