Do you have an estimated release date for the 2012 METAREA and CITY variables?
While IPUMS-USA does not currently have an estimated release date for the 2012 ACS geography variables, it is likely that a majority of these variables, including CITY, will become available by the end of the summer if not sooner. METAREA is not currently being created for the 2012 ACS sample, but a new variable has been created identifying the metro area of residence using the official 2013 delineations for Metropolitan Statistical Areas (MSAs) from the U.S. Office of Management and Budget. More information on this new variable will be available when it is released on the IPUMS-USA website.
I hope this helps.