According to info shared by Pinnacle the plan is to have a ‘Savage Pathfinder’ rule book which has all the rules you will need (so no need to buy the ‘core’ Savage Worlds book) and a box set which covers the full Adventure Path. I presume there will be a rules box set option but that is likely to just bundle up the book with specific bennies and other accoutrements.
So, it doesn’t look like that there will be an official conversion book but people familiar with SWADE core should be able to reverse engineer that.