Somerville can play at loose-head or tight-head and has made 59 appearances for the All Blacks.
Yapp went to loose-head, with Paul James shifting across the front row to take up the tight-head role.
In the front row, Ireland's Jerry Flannery and Scotland's Ross Ford both get two votes apiece at hooker alongside loose-head Jenkins, while another Scot, Euan Murray, is favourite to start at tight-head prop , with only Davies differing.
South African-born Dragons prop Rhys Thomas is a surprise replacement for Adam Jones at tight-head.
Toulouse's Census Johnston comes in at tight-head prop for Samoa in place of Anthony Perenise.
In-form Dragons prop Rhys Thomas could claim the tight-head shirt ahead of Adam Jones.
Tight-head Wilson picked up a shoulder knock against Wales, limiting his participation in training this week.
Mitchell faces Scotland on Saturday in the Six Nations as a stand-in for injured tight-head Adam Jones.
The Gloucester tight-head will undergo surgery on a back problem this week and will be unavailable for selection.
Exiled Ulstermen include former Ireland flanker Neil Best from Northampton Saints and Exeter's Belfast-born tight-head prop John Andress.
Euan Murray takes Moray Low's place at tight-head prop, and Richie Gray and Richie Vernon also make debuts.
BBC: Scotland add Greig Laidlaw to squad for All Blacks game
The Worcester tight-head, expected to arrive on Friday morning, will be the only replacement prop on the bench.
Tight-head Euan Murray was penalised for standing up in the scrum and Bergamasco slotted over the simple penalty.
James and Mitchell have already experienced Test rugby at tight-head as replacements for British and Irish Lion Jones.
Of the three new caps, teenager Luke Fitzgerald, son of former tight-head prop Des, will be monitored the most.
The tight-head joined the Tigers from Toulouse in July last year and has made 24 appearances for the club.
But John Afoa may be drafted in at tight-head prop if Neemia Tialata fails to recover from an illness.
Ospreys tight-head prop Ross Davies is also out for the season (ankle injury).
The 27-year-old, widely regarded as the best tight-head in the world, will leave the Otago Highlanders after the World Cup.
Murray was Scotland's tight-head during the autumn Tests but was released by Northampton Saints last month before joining Newcastle Falcons.
Tight-head prop Brendon Botha was also promoted in a tactical switch with CJ van der Linde dropping to the bench.
Tight-head prop Vickery is a veteran of two World Cup finals and two Lions tours and will bring invaluable experience.
One of those was meant to be Worcester's Chris Horsman, but the tight-head misses out over a row on Test dates.
Tight-head prop Van der Linde was initially picked to play against Fiji but pulled out on the eve of the match.
More immediately, Vickery's absence will mean 38 year-old Andy Deacon will continue at tight-head for Gloucester for the rest of the season.
Specialist tight-head Harrison, 28, will ease the burden on new Wales cap Rhys Thomas, Chris Anthony having retired with a neck injury.
The 24-year-old tight-head has signed a three-year deal and will join up with his new team-mates at the liberty Stadium in the summer.
Jones spent most of the 2004-05 season playing at tight-head, facing the renowned scrumming powers of Munster and Castres in the Heineken Cup.
After all the talk over the Wales tight-head position in the build-up, there were only a handful of scrums in the first half-hour.
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