It should be coming out later this year. So it'll be like Artemis ending and a new tale beginning in the same year.
I think the new AF GN is also coming out later this year. And then there are some more new books I'm looking forward to getting my hands on.
From what I've read, the series is about a modern-day Witness Protection Program that hides its clients in Victorian England. At least, that's the understanding I got. And since it's Eoin Colfer, it's bond to be hilarious! I'm really excited!