As I suspected, the UFC will be airing a taped PPV show opposite of EliteXC's October 4 show. UFC 86 will air on Spike head to head with EliteXC, and if they time it right the goal will be to have Quinton Jackson vs. Forrest Griffin on opposite of the Kimbo fight.
Source: Television commercial during Ultimate Fighter.
UFC 87 will air on October 11 on Spike. This was probably originally scheduled in order to counter program Affliction.