from Variety.com:
"Heroes: Origins" will air in "Heroes'" Monday night time slot when that smash hit takes a hiatus. The net has ordered six segs of "Origins," which, combined with "Heroes," makes for 30 hours altogether.
"Heroes: Origins" will center on characters not yet seen on the original show. Peacock has also added an interactive element to the show: Viewers will be asked to pick their favorite character from "Origins," who will then join the cast of the full-blown "Heroes" skein the following year.