** LEGAL UPDATE **
Another change to U.S. immigration procedure is underway, as U.S. authorities attempt to respond to Trump's Executive Order 13780, “Protecting the Nation From Foreign Terrorist Entry Into the United States.” The order mandated that the Department of Homeland Security (DHS) and related agencies create a "uniform baseline for screening and vetting standards and procedures, such as in-person interviews...."
U.S. Citizenship and Immigration Services (USCIS, which is part of DHS) thus recently announced (in a Policy Alert) that it plans to begin:
The adjustment of status interview is a fairly straightforward part of the green-card application process in the United States, which many other categories of applicants routinely go through (such as spouses of U.S. citizens). For straightforward cases, the interview mostly involves reviewing the written application and any original documents and going over any changes since the application was filed.
Nevertheless, you'd be wise to learn about and avoid the Top Mistakes Applicants Make at Adjustment of Status Interview.
It's entirely possible that this expanded interview policy will create delays for people awaiting their adjustment of status interview. Already, the wait for an interview is several months long at many of the USCIS field offices. To check on the latest backup at the USCIS office where you will be interviewed, go to the USCIS Processing Time Information page and choose your local Field Office from the dropdown menu, then look at the line for Form I-485.