At a recent summit, the Acting Secretary for the Pennsylvania Department of Environmental Protection has asked operators to comply with new E&P rules even before they become effective, according to this article in the Scranton Times-Tribune. "The summit came ahead of action by the state Environmental Quality Board on Monday on several proposed regulations to require that oil field-grade cement be used in Marcellus Shale wells, to delineate responsibility and notification procedures for gas migration problems and to strengthen requirements for treating drilling wastewater and limiting sediment erosion from wells."
For more on the regulations themselves, see this press release issued by the PA DEP. Also, see here, which contains links to presentations, comments and other documents related to the proposed rulemakings (scroll down to the May 17, 2010 Meeting Agenda).