According to mmafighting.com:
"The UFC contacted us yesterday, and I think they want to put a rematch together, so I think a rematch is in the works," Penn said Tuesday morning in an interview with 106.7 The Fan in Washington, D.C.
"I think the next three months, four months at the most," Penn said.
The three or four month range would indicate that Penn vs. Edgar 2 could be the main event at the UFC's tentatively scheduled August 28 pay-per-view show in Boston. If the UFC really wants to give fans a great fight for free, it could also possibly be the main event of the August 1 Versus show in Oakland.