The loose forwards feature recent regulars, including Hurricanes lock/flanker Vaea Fifita and Ioane.
Damian McKenzie has, as expected, been recalled as a first five-eighth after Aaron Cruden's departure to France.
But, as it has all year, the midfield offers the main talking points. Charlie Ngatai's return is a feel-good story after his long-running battles with concussion and injury now hopefully behind him.
Likewise Buckman, the Hawke's Bay and Highlanders favourite nicknamed "Barracuda" has been listed as a midfielder but he offers ability to cover outside back roles if needed.
His selection is reward for hard work and consistency over a number of years on both attack and defence.
Nehe Milner-Skudder also makes his return in the stacked outside backs.
All Blacks squad for two-day camp:
Forwards
Hookers: Dane Coles, Nathan Harris
Props: Props: Kane Hames, Nepo Laulala, Atu Moli, Jeffery Toomaga-Allen and Ofa Tu'ungafasi.
Locks: Dominic Bird, Tom Franklin, Brodie Retallick and Patrick Tuipulotu.
Loose forwards: Sam Cane, Vaea Fifita, Akira Ioane, Jerome Kaino, Ardie Savea and Liam Squire
Backs
Halfbacks: Tawera Kerr-Barlow, TJ Perenara and Aaron Smith.
First five-eighths: Beauden Barrett, Damian McKenzie and Lima Sopoaga.
Midfielders: Richard Buckman, Ngani Laumape, Anton Lienert-Brown, Charlie Ngatai, Sonny Bill Williams
Outside backs: Jordie Barrett, Rieko Ioane, Nehe Milner-Skudder, Waisake Naholo, Julian Savea, Ben Smith.