Professor Richard Bedford from Population Studies Centre at the University of Waikato highlighted the major changes taking place.
Canterbury Crusaders coach Robbie Deans is believed to be in the frame, as is Waikato's Warren Gatland.
Nine players including captain Wayne Ormond, fly-half Kevin Senior and full-back Adrian Cashmore have been based with Waikato Chiefs.
BBC: SPORT | Rugby Union | Lions in NZ | Plenty opt for forward strength
Gatland watched his Wales side lost 29-10 to the All Blacks in at Waikato Stadium in Hamilton on Saturday.
The Otago Highlanders also enjoyed an impressive away win with a 29-16 triumph over the Waikato Chiefs in Hamilton.
In other second-round action on Saturday, Australia's Queensland Reds beat the Waikato Chiefs of New Zealand 39-25 in Brisbane.
The Blues overcame the sending-off of lock Troy Flavell after just five minutes to dominate possession and score four tries to Waikato's three.
"Light volcanic ash fall can be anticipated downwind of Tongariro", it said, potentially affecting the Waikato, Hawkes Bay, Gisborne and Bay of Plenty areas.
The ex-New Zealand A, Waikato Chiefs and Canterbury Crusaders man, 27, arrived last week, playing against the Blues and Glasgow where he was injured.
He takes over the Waikato number nine jersey from All Blacks scrum-half Byron Kelleher and he intends to keep it until he leaves New Zealand.
BBC: SPORT | Rugby Union | Irish | Boss aims for World Cup selection
Wales' 2008 Grand Slam coach has also been linked to the Waikato-based Chiefs role Ian Foster is to vacate ahead of the 2012 Super 15 season.
The ex-Wasps and Ireland coach, 44, will start his new role in December, having been prised from a job with Waikato in his native New Zealand.
Roberts will have a new partner in midfield at the Waikato Stadium after Andrew Bishop was ruled out of the second Test with a broken hand.
Gatland and Edwards have remained close friends since their Wasps days, even when former Ireland coach Gatland returned to his native New Zealand to take up a post with Waikato.
But Gatland can call on an outstanding personal pedigree, having been capped 17 times between 1989 and 1991 for the All Blacks and appeared 140 times in a 10-year career with Waikato.
Gatland coached Waikato to the 2006 Air New Zealand Cup - the level below the Super 15 tournament - after returning home following his stint at Wasps and has great pride in his roots.
He is currently assistant at Super 14 team the Chiefs and is also in charge of the Waikato NPC side, and Waikato Rugby Union chief executive Graham Bowen said he departs with their blessing.
The Wales coach, who played almost 150 games as hooker for Waikato between 1986 and 1994, and his team had spent much of the second Test build-up in the Hamilton community on a charm offensive.
London Irish prop Rogers and former Waikato Chiefs openside Sinkinson are among four changes from the side beaten 29-23 by Ireland nine days ago - with Wales coach Graham Henry opting for a dramatic re-shuffle up front.
Kerry Black, a researcher at the National Institute of Water and Atmospheric Research and at the University of Waikato, in Hamilton, New Zealand, and his colleagues have been finding out what makes good waves on other coasts.
Gatland is also being heavily linked with a home-coming to replace Foster as coach to Super 15 franchise Waikato Chiefs - based in Gatland's home city of Hamilton - when Foster stands down at the end of next season's competition.
He met WRU officials in New Zealand last month at the start of the Union's global search for a new coach and arrived in Cardiff at the weekend, but he will return down under to complete his commitments at Waikato before taking up the job.
Gatland took his team for a training session at a local school and the squad undertook a traditional Maori experience on Hamilton's Waikato river in a bid to win some local support as Wales will play both Samoa and Fiji in the North Island city in next year's Rugby World Cup staged in New Zealand.
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