What does it mean when my visa extension is under consideration and what do I need to do next?

The user currently holds a 90-day O visa as a spouse, which expires on December 9th. They've applied for a 1-year extension, and immigration has stamped their passport with an 'extension of stay is under consideration' note, requiring them to check back by January 8th for the decision. They also received a notification regarding their 90-day reporting responsibilities. Comments from the community clarified that the 'under consideration' stamp could lead to a one-year extension and that a TM47 receipt is associated with their 90-day notification requirement.