Konami reveiled the release date for PES 2013 Data Pack 6.00. PES 2013 Data Pack 6.00 Download will be available 21/05/13.
Konami have not yet announced the exact features of the new PES 2013 DLC, according to Konami employee Adam Bhatti, it will only fix some issues that occured for people when installing PES 2013 Data Pack 5.00.
@bigol83 @onlyproevo it's a fix to some issues people were having with installing previous data pack. Nothing to shout about, so we didn't.
— Adam Bhatti (@Adam_Bhatti) May 16, 2013
IMPORTANT If you are using PESEdit.com 2013 Patch, you should not install the PES 2013 Data Pack 6.00 download right when it is released, but instead wait for an updated PESEdit.com 2013 Patch version released by PESEdit.