Devlin said there was an element of risk in any change.
"It's like anything new that you start, you ask people to give you a try ... There will be all kinds [of music]. We won't be playing Katy Perry."
Devlin will be joined on the new show by Laura McGoldrick, a host of Sky TV's cricket coverage.
Hauraki is owned by MediaWorks' rival The Radio Network. APN, the publisher of the Herald, is a joint owner of TRN.
Devlin said: "It's bitterly competitive, and there's a lot of money at stake, and there's a lot of pride and ego at stake."
War over Weet-Bix
Ratings for competing Auckland breakfast radio shows 6-9am, cumulative audience of males 25-54:
* The Rock - 24,400 (MediaWorks)
* Classic Hits - 12,600 (Radio Network)
* The Sound - 12,200 (MediaWorks)
* Hauraki - 8200 (Radio Network)
Source: The Radio Bureau, T2, 2012 Research International survey.