Before any federal agency regulations can be issued, they are required to be reviewed by the White House Office of Management & Budget (OMB). A little look-see at an obscure OMB webpage shows it currently has 17 regulatory submissions under review from the Center for Medicare and Medicaid Services.
A former CMS official I spoke with thinks this might be a record number of healthcare regulations under review by OMB at any one time. Scary, but it is likely a record that may not stand for long given all the other regulatory requirements of PPACA.
One of the biggies the physician community is waiting on is the proposed rule outlining the requirements under the Medicare Shared Savings Program: Accountable Care Organizations.