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Here is what I did for the estimate.
I took all 20 teams, added them up, divided by 20.  From this number I used 95%(based on not all teams having cut players).  After this I multiplied by 1.25 to get the cap figure.  
I pretty sure that the top 27 PB values on each team is what will be used for the cap.
I would imagine my number estimate is withen 2-3 points on where it is going to be, and is to be used as a guideline to help some of the teams that are close.  The actual cap may be 103, or it could be 108.  A couple points shouldn't make a huge difference. Teams can use this number to plan ahead, if they choose.