I have recently built a SharePoint 2013 farm and have migrated the content of a SharePoint 2010 environment mainly the ContentDB for the Intranet Web App into SharePoint 2013 via the database attach/detach method.
All the content is there and the environment is up and running. I did get the usual errors to do with missing features, web parts which are referenced in the migrated database but are not yet present/deployed in the 2013 environment.
In any case I know that SharePoint 2013 includes the 14.0 a hive for compatibility with SharePoint 2010.
Are the SharePoint 2010 WSPs normally deployed as per usual in SharePoint 2013 (using Add-SPSolution)? Do any modifications need to be made to the WSPs before deploying? or does it automatically get deployed to the correct hive (14.0 in this case)?