Despite reports that Top Rank was basically packaging their November 12 and December 3 pay-per-view events, Steve Kim spoke to Top Rank President Todd duBoef, who denied that any such package deal was in place:
Ok, @ToddDuboef has said 'No decisions have been made' regarding HBO or Showtime on Pac-Marquez, also, no other fight is tied to that fight. Cotto-Margarito is it's own separate deal and so is the Salido-Lopez rematch.
The idea of packaging the two pay-per-view events (Pacquiao vs Marquez and Cotto vs Margarito) was an interesting one, as it would have required someone to, in all likelihood, overpay a bit for Cotto vs Margarito.
Kim also reported on Twitter that Top Rank is looking at October 15 for the rematch between Juan Manuel Lopez and Orlando Salido, but that's the date of HBO's PPV headlined by Bernard Hopkins and Chad Dawson. Whether or not Showtime would want to pay for a Salido vs Lopez fight when they're going to lose a big chunk of a potential audience to an HBO PPV is debatable, but it wouldn't be a shocking little risk to take. Hopkins vs Dawson is destined to bomb on PPV (where everyone agrees it doesn't belong, but it's a budget issue), but even still, that's a night currently occupied by big name fighters. The October 15 date would also prevent HBO from bidding on the Salido vs Lopez rematch, but they just might not have any money available for it anyway.