Sad to see McCullum retire, but probably the right time for him to move on I guess. The shift in culture of the team that he has created over the last couple of years has been quite remarkable.
Not sure we have anyone who'll be able to fill his shoes straight away. It will be tempting to leave Kane to concentrate on batting, and he doesn't seem to love the media and public profile that will come with the captaincy. I saw Watling mentioned, but he doesn't play across all formats. Not huge love for a bowler (Southee/Boult) either.