I just sent the revised manuscript for the second Riftsiders book to my agent editor.
The first book isn't even out yet, and we're plowing ahead. I have no idea if more edits are coming first round, but once to the publisher, they have to OK it and then go through yet more edits there. In the end, it will probably actually be released. When? I have no clue at all. It would be very cool if it's late 2022, but, I know nothing.
No spoilers about who survived the first book, so I can't tell you much about the second book. Just that it's called IDENTITY THEFT.
I fall goes as planned, I'll be working on Book 3 sometime later this year, among some other projects not in the Riftsider world.