My two cents worth has the Kelvin with over/under nacelles sporting blue/red ram scoops. The blue "eye" on top is pretty much what you'd expect those turbine ramscoops on the trailer 1701 would look like when run up and opertional. As I've said in another thread, dual colour scoops could mean segregated functions in the gas collection cycle (ie. ionize/collect).
The idea behind the "turbines" in the trailer was to be the machinery behind the red nacelle domes, the source of the spinning light patterns we all know and love. The ship was under construction, so the nacelles weren't complete, and the interior machinery was exposed.
The so-called "eye" looks almost exactly like the TMP Enterprise
's deflector dish. Given that there's a strong TMP influence on the designs, I think it has to be a deflector.
By the way, is some sort of deflector mounted centerline on the front of a nacelle such a horrible thought? We know trek def dishes have been portrayed as multi-function devices before. Couldn't doubling up a dish/scoop be an option when ship design requires frontal area be kept to a minimum, for what ever reason?
How can the same instrument both deflect interstellar matter and suck it up at the same time?
The alternate idea that the Kelvin has only one ventral nacelle and a big deflector hoisted up well above the main saucer is, well, truly "fugly" IMO, both in looks and possibly dynamics.
Why? There's no up or down in space, except relative to the ship interior. We've seen in First Contact
and ENT that the gravity field doesn't extend past the hull (even though that makes absolutely no physical sense). So why is an engineering hull "above" the saucer any different dynamically from an engineering hull "below" it? For that matter, remember that Jefferies's original design sketch for the Enterprise
did, in fact, have the engineering hull above the saucer and the nacelles below it. The Kelvin
appears to be a cross between that original orientation and the Franz Joseph Saladin