From overthecap.com:
The current cap number is $2,639,725 which represents the $750,000 base salary, the $1,311,600 in workout bonuses and 1/16 of the roster bonus which is $578,125. From the comment above apparently only 1/16 counts against the cap to begin with since he only appeared in 1 game last year. As he earns the additional roster bonuses they will be added to the cap.
With that said, my question would be do we need to head into the season with $8,671,875 of additional cap space to cover the potential additional roster bonuses?