FROM THE IRS:
The IRS is aware of the great interest in the 2012 tax forms, instructions and publications, and therefore, is shipping tax products as they become available. Since the availability of some tax products is impacted by pending congressional action, please note that instruction booklets may arrive weeks after you receive tax forms this year.
The IRS website at http://www.irs.gov/ is the most up-to-date source for federal tax products and information. IRS first publishes the electronic version of tax forms, instructions and publications on its website, and then the printing and shipping of the paper version will follow.