Hansen says rivals have had time to innovate since last meeting
There are few secrets in international rugby these days - video analysis in which every play, and player, comes under the closest scrutiny has seen to that - so the All Blacks are wary about an England team which has flown under the radar since June.
The last test Stuart Lancaster's team played was the 36-13 thrashing at the hands of the All Blacks at Waikato Stadium on June 21. Since then the All Blacks have played seven tests, winning five, drawing against Australia in Sydney and losing to the Springboks in Johannesburg.
As far as Steve Hansen is concerned, Lancaster has had ample opportunity to assess where the All Blacks are at. But for Hansen, there is a fear that his team are heading into the unknown.
"You've got to work on the what-ifs - what will they do differently? We've played a lot of games since we last played [each other]. They've played none. What are they going to bring that's different? Have we covered it all off in our thinking or have we missed something? It would be annoying if we missed something and they get away with it but I guess that's rugby isn't it?"