Just prior to the DOE's meeting on July, 29 - EPA released a report on July 25 from the agency's Inspector General (IG). In this report, the IG found that EPA was doing too little to limit methane leakage from natural gas transmission lines and the natural gas infrastructure. From the IG's report, it appears that the voluntary programs have not "succeeded in limiting the output of methane emissions from pipelines."
The report suggests that EPA needs to increase its efforts to limit these emissions including proposing new regulations either on its own or working with other agencies such as DOT. The report specifically indicates that the transmission sector was not included in EPA's 2012 oil and gas regulations.
This combined with DOE's recent announcement - it appears that the natural gas transmission sector is in for some changes.