The SPX weekly options are now listed for 4 separate dates. They used to be listed one week at a time, with the new week added on Thursday. Starting today they are listed 1 month out, four separate expiration dates.
Here is a link to some commentary and color on the new weeklies. http://communities.cboe.com/t5/What-s-On-Our-Minds/A-Change-for-Weeklys-by-Mark-Sebastian/ba-p/2821