Today they have gone into some more detail on the import options available for Edit Data sharing and kit importing.
"Edit Data Sharing Available for PS4
Share the teams and players you create with other users simply by transferring them via USB Data sharing is multiregional, allowing European users to share with fans from the US or Asia.
Batch Import *Exclusive to PlayStation®4 system Import all your edited kits and player data in one batch via USB. Select your team and apply the data you choose.
Adjust how high you want to show the team name and squad number. You can import even more images than before, now that you can change their resolution. (For example, you can change a 2048 x 2048 resolution image to 1024 x 1024, allowing you to add up to 1000 images for kits.)"