"Earlier this year, we learned about the improved Bombers’ Notebook in Majora’s Mask 3D. Among the improvements is a new interface that makes it easier to understand and keep your appointments. However, after spending time with the demo at PAX South, I realized that there are many more changes — including the addition of many new entries.
In Majora’s Mask for the Nintendo 64, the Bombers’ Notebook has a fixed set of 20 entries. Those entries guide you through all of the major sidequests. Completing those quests rewards you with Pieces of Heart, masks, and other items. Majora’s Mask 3D appears to include the same 20 entries, but many more entries have been added."