This may well be one of the coolest finds in recent memory. Julien Porret was a teacher at the Paris Conservatory. This Paris Conservatory connection gave him access to some of the people who studied and taught along side J.B. Arban during his tenure there. Julien worked with Merri Franquin and Alexandre Petit, both contemporaries of Arban, who taught Julien the ins-and-outs of the famous Characteristic Studies from the Arban book.
After taking in all of this knowledge, he wrote this book. Each study has a preface that explains exactly how Arban used to teach the particular challenges within, and includes multiple pages of exercises for each study to help you tackle the complete etude in the most efficient way possible. There is simply no closer way to studying with Arban himself than with this book, it is truly astounding.
You can see the supplemental material that goes with the first characteristic study in the samples to the left. Porret also included complete markings and dynamics that were missing from the original Arban method, and corrected errata as well.
This book cannot be given enough praise in this writeup, any serious trumpeter is going to go mad for this. Immediate digital download above for all the keeners out there.