I love how The Rising ended, but I felt like there were some unanswered questions ... is there a possibility that there will be another book or trilogy following Maya or Chloe?

Not right now. I’ve put them in a “safe enough for now” place, and I’m going to let them stay there and rest :) As for unanswered questions, I don’t believe it’s possible to answer every question raised by a series, and even if I tried, readers would find more. I suspect I could kill off every character, thinking that definitively ends a series, and readers would still say “But what happened to them in the afterlife” LOL There are a few unanswered questions in DP/DR, but that just leaves room for possible future stories.