There is a new Guide to Advancement book for 2025. It includes all of the latest information about how the advancement program should work. There are a couple of minor changes in how a Scout applies for the Eagle rank.
The biggest change is a new application form that must be used. You cannot use the previous forms. Make sure you fill out the Jan 2025 version which includes the Scouting America logo. It also includes the other changes.
Another change is the number of reference letters that are required and who those letters should come from. In the past six letters of reference were requested. That number has dropped to four. Current unit leaders can no longer submit a reference letter. Their signature on the application is considered a recommendation. Parents or guardians are now strongly discouraged from providing a reference letter and religious leaders are allowed to submit letters but are not required.
The links below will take you to the new guidebook, the new application form and some information sheets that summarize the new reference letter requirements.