I don't know if it's been noticed but:
http://blog.iheartradio.com/Pages/NBC-News-Radio-Now-on-iHeartRadio.aspx
http://blog.iheartradio.com/Pages/NBC-News-Radio-Now-on-iHeartRadio.aspx
I know in Nashville the two main stations for news that associate with iHeart (WLAC/FOX) & WWTN are not carrying it.
WWTN is owned by Cumulus, so they definitely WON'T carry it. They're most likely using the unbranded WW1 news package.
I imagine the relationship with Fox will continue. The branding works well with conservative talk AM stations.
This version of NBC isn't even curated by NBC.
That would require them to staff it. This is just a branding and content deal.
I remember one incarnation of NBC News Radio was actually staffed by NBC News people, but that was maybe 8 years ago.