Might change on Fox: More appearances by pro athletes from other sports.

It's already been established in an earlier slide that Fox network would like some changes made to WWE's Smackdown program. They want it to be a more serious sports presentation, akin to what the NFL produces, and they also want it to have less of the outlandish aspects of sports entertainment.
Fox sees its sports block as a golden opportunity for cross promotional stunts. This means they want to, in essence, advertise the different programs on each of its sports block shows. Fox wants to be able to generate excitement for all of its programming by using the tools they already have.
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What this means for the WWE is that appearances by sports celebrities will likely become the norm rather than the exception. While they will probably not be actively involved in wrestling matches or storyline angles, there is also a possibility that they might do just that. In any case, you can look forward to see stars from other sports brands showing up on Smackdown, even if it's just to say hello.