It is no longer necessary to use this work-around, the WordPress Google Forms plugin now supports the new version of Google Forms.  This post remains here are part of the development history of the plugin.

Thanks to a tip form Kevin Dillon, a work-around to the problem with new Google Forms has been identified!  Legacy Google Forms are still available IF you start creating the form by opening a SpreadSheet first.  Once the spreadsheet is open, select “Create a legacy Form” from the “Tools” menu.  The form editor and published URL will be the same as those that had worked prior to the Google Forms update.