This was requested so it's going into the review as well :P.
The Review -
First things first, the Warp Hunter is IA only so unless that is allowed at tournaments, it's not part and parcel of the standard Eldar army. It's got the standard heavy tank lay-out as well - AV12 side and front with rear AV10, BS3, fast, tank and skimmer with two weapon systems - one heavy & one twin-linked catapult. The defining feature is it's big old gun - D-cannon on steroids with special rules - which of course brings comparisons to the Fire Prism.
At 36" it's a lot shorter ranged than the Fire Prism but fits in with the general theme of the Eldar army but outside of anything AV10/11, it's the weakest platform around for Eldar so loses a bit of durability there. Beyond that, well the gun is pretty lethal against infantry with always wounding on 2's, instant death on 6's and an AP2 (which is actually good because the D-Cannon is a barrage blast). This is exemplified by having a template option which can be fired like a hellhound up to 6" away from the Hunter - aka more reliable infantry death.