Not really a bolter. With Vettori retired and NMac aged 34, there needs to be a new ODI / T20 spinner in the next couple of years....Mitchell Santner. Living in WA never heard of him. Looking at Stats only 20 matches at 27 and 28 Ford and Plunket Shield. Not exactly setting the world on fire bit still young.
...To be honest no big changes and only one bolter in Santner...
Santner had a good limited over season, in 50 over cricket this season 326 runs @ 36, SR 99 with 11 wickets @ 36 at 4.9 RPO. Not so many batting chances in T20 but tidy bowling, 7 games, 28 overs at 5.6 RPO.
IMHO a Hesson / Edgar selection very similar to picking Anderson and Neesham in early 2013 ahead of Ellis, have decided that Santner has potential to be a long term international player and needs a 2-3 year run in the squad to see what he is capable of.