One thing Haskell does have over Kvesic that can't really be disputed is versatility. Hask has played all over the back row while Kvesic is pretty much a specialist 7 (I know he played some 8 at Wuss, but still). Haskell should be in the EPS in place of Johnson, another versatility player, at very least. He's better when playing out of position, more experienced and in better form IMO.
The Robshaw, Wood, Morgan, Binny quartet isn't likely to be intentionally broken up before the World Cup and nor should it be. We've got a well balanced back row that seems to work. However if me rely on just those four to get us from now all the way to the RWC final then we're obviously going to come unstuck. Quite apart from having to have reserve players in case of injury, we can't reasonably ask four guys to take all of load. This is why the first test is a really good opportunity because it gives us a chance to test out our other options.
For my money I think, with Wood and Binny presumably missing, something like 7. Robshaw 6. Haskell 8. Morgan starting is our best shot. Thats a back row that will tackle the NZ forwards into the ground and still be mobile enough to attack well. Obviously that leaves Kvesic on the bench, to come on at blindside and either replace Haskell man for man or, if Morgan takes a knock, have Hask move to 8. I think what Peat says about Lancaster's flanker philosophy is spot on. He'd like a fetcher but will not sacrifice playing his best two flankers in order to accommodate one.
Looking long long term, one of Robshaw or Wood will go post-2015. Kvesic and Wallace are both snapping at their heels a bit already and if they continue on their current trajectories they're going to be too good to ignore. I suspect whoever keeps there place will also get the captains armband.