Federal regulators hope to begin reviewing a final version of the Volcker Rule—the Dodd-Frank Act requirement that would put prohibitions on proprietary trading by banks—any day now and issue it to the public in mid-December, but don’t hold your breath.

As it begins to look like regulators from a group of agencies responsible for completing the rule could miss that deadline, like many others deadlines they have missed since Dodd-Frank was signed into law in July 2010, opponents of the rule are making a last-ditch effort for changes and alternatives.