Checkpoint (RNZ National) has the podcast of the following news item:
"The Government has shelved changes to the Resource Management Act until after the election having failed to get the backing of United Future and the Maori Party."
http://podcast.radionz.co.nz/ckpt/ckpt-20140519-1734-govt_delays_rma_changes_makes_them_an_election_issue-048.mp3

The RMA Bill was covered at the Post Cabinet Press Conference.
Scoop has the full audio of the "PM Post-Cabinet Press Conference - 19 May 2014"
http://www.scoop.co.nz/stories/HL1405/S00164/pm-post-cabinet-press-conference-19-may-2014.htm

Morning Report (RNZ National) covered the story:
"National will try seek mandate for RMA changes-   The Prime Minister, John Key, says the National party will try to seek a new mandate during the election campaign to push through controversial changes to the Resource Management Act."
http://podcast.radionz.co.nz/mnr/mnr-20140520-0751-national_will_try_seek_mandate_for_rma_changes-048.mp3