The Treasury Department and the IRS have decided to withdraw §1.148-1(f) of the 2013 Proposed Regulations relating to issue price and to propose new regulations. The new proposed regulations have been filed with the Federal Register and are scheduled to be published in the Federal Register tomorrow, June 24. There will be a 90-day comment period and a hearing is scheduled for October 28, 2015.
The new proposed regulations are available here.