Well, since Innistrad is one of my favourite planes and the involvement of Teferi is probably going to lead to something important, this actually drew me back into reading the stories. I'd say this was a pretty decent start for the new set. The timing is good, too, releasing this when we've barely seen any cards from the set keeps it spoiler free and leaves the mysteries intact for now.
My only major criticism of this particular story would be the weird present tense style it's written in.
On the plus side, it was cool to see a Falkenrath vampire portrayed exactly as the original worldguide describes them and their attitude to hunting. I always love recognising little details that make for consistent worldbuilding. The nod to the wolfir was also appreciated, seeing more of Arlinn is great, and I really like how organic the witchy Harvesttide stuff feels to the setting. We've been told that all sorts of pre-Avacynian nature cults and folk religions used to exist on Innistrad and still have some lingering remnants here and there, and it's only logical that they would resurface after Avacyn's death. This new aesthetic with candles everywhere is actually pretty reminiscent of
Providence IMO. It's just cool to see the kind of plane again that has enough depth to explore new directions and keep itself fresh without the creative folks at WotC having to pull stuff entirely out of their butts.
It's not quite clear from that scene what's going on, but did anyone else get the impression that Klaus the vampire was about to transform into a werewolf? That would be new, but it would make sense for the werewolf curse to become stronger and more virulent, considering the premise of the set. I wouldn't say no to a Vampire Werewolf in this set, sounds like it would be one hell of a beast... And if the Day/Night mechanic is anything to go by, werewolves might transform every night now rather than just at full moon? Which is even worse for the folks on Innistrad because the nights keep lengthening...
Curious to see what the deal with the Celestus is and why Teferi is going to be involved with it. I guess Innistrad just needs someone to cast
Equinox. No, wait, wrong story...