If you've previously tackled these missions solo, your lone wolf approach will no longer be an option by the end of this month. When starting up a Weekly Heroic Strike after applying patch 1.1.1, players will be automatically paired up with random co-op partners via matchmaking before the mission can begin.
"We wanted the Weekly Heroics to be a challenge that pushed you and your buddies, but what we observed was that these strikes don’t demand the same cooperation of a cohesive pre-made group," Design Lead M.E. Chung stated. "The overwhelming community response was such that many players didn't have the numbers on their friends list to experience the activity on a weekly basis."
Nightfall and Raid missions will continue to operate with no changes; only the Weekly Heroic Strike missions will see the addition of required matchmaking. Bungie aims to have Destiny version 1.1.1 out by the end of February.