Nowadays I don't really have any authors or book series like this. As I kid I used to get really excited for a new Series of Unfortunate Events or Alex Rider book. For a while I kept my eye on Adrian Tchaikovsky, but lately I've found some of his novels to be hit or miss.
The only book release I'm currently looking forward to is Brigands & Breadknives in the Legends & Lattes series by Travis Baldree. The other two books have been cosy and wholesome, and it's become a little tradition of mine to read these books around Christmas.