ACK-SHUYALLY, the game takes place 23-24 years after
Castlevania III OR the Netflix animated series OR a weird hybrid mix of the two.
The man holding the letter is Trevor. The letter itself is likely being read to the audience in the voice of the person that authored it or Trevor himself. The girl standing in front of him is either:
- One of his two daughters (animated series timeline)
- A daughter as yet unintroduced into the canon (video games)
- Sonia (a retcon to bring the character into canon in a way that aligns with the established video game continuity)
Or it's some kind of amalgamation of multiple interpretations of the series or something completely new. The scar on the man's face, over his eye, is in the same place as Trevor's from the animated series. The trailer is also awash in red hues, which is representative of the animated series as well. This doesn't definitely PROVE it's Trevor but the scar is a big hint IMO.
So this is either a follow up to the animated series, which Konami likely believes is the best way to attract new fans that have been introduced to
Castlevania via Netflix, or it is pretending to be one while also being an entry in the game timeline.
SOURCES: Trust me and the internet, bro