There will be 13 unreleased tracks in original form on the next 2Pac album. This came straight from Lara Lavi herself. No, my source isn't from an article on the internet. I asked her personally to confirm the 2Pac album release during an interview I conducted and she was kind enough to answer all of my questions.
The interview will be posted up on RapWeekly.com sometime this year. I also plan on posting up another 2Pac related interview exclusively for StreetHop.com that I did 1 or 2 years ago.
EDIT: In connection with DP's post, please keep in mind that the interview I conducted was during the second quarter of 2009.