February 1st to February 7th - The Statesman Task Force (from Statesman in Independence Port)/ The Lord Recluse Strike Force (from Lord Recluse in Grandville)
February 8th to February 14th - Return of he Reichsman (from Dr. Kahn in Founders' Falls) / Thus Spoke the Reichsman (from Barracuda in Grandville)
February 15th to February 21st - The Lady Grey Task Force (from Lady Grey in the Rikti War Zone)
February 22nd to February 28th - Clamor and Destruction (from Sister Psyche in Independence Port) / Pirates of the Skies (from Silver Mantis in Sharkhead Isle or your supergroup or villaingroup base's mission computer or oracle)
And for future weeks I can edit this post with the next week.
For the details of how this works. Here is the link.
http://www.cityofheroes.com/news/game_updates/issue_19/issue_19_strike_pack.html