What you are going to notice in this version is that all of the base files have disappeared (Combat.xml, Cultures.xml...) and a new file called Config.xml has appeared. Config.xml holds all the information that Combat.xml, Cultures.xml and so on held when it came to mapping files. This Config.xml also contains the same mapping information for any book you have installed (for example if you buy Martial Law and install it, those files will show up in this Config.xml). If you have created any new files and have remapped them, then you will want to go into Config.xml, find the original database path and make your changes there. You can even do this from the AutoHARP program as I have a front end for Config.xml.
Other changes include
DefensesFromCoreRules.xml includes a new ArmorPiece section that maps armor types to armor pieces. If you have any custom rules in this xml all you need to do is copy the ArmorPieces nodes found on the top of the file into your new file.
I think that is the only main database change for Harp Fantasy. I'll look up any more changes, but I think that was the biggest change. Oh and of course the BMR updates in the Races file.
So there is a major update to the database but it concerns the base files. From your past posts my guess is you have custom xml files and you just remapped them thus all remapping is done in the Config.xml file.