Dammn, I was going the full aftermarket system, but sold my gf's head unit and gave her mine haha.
I am not a Hyundai tech or anything, there are a few on the forum though, so what ever I say could be completely wrong
Just saying. And not that this directly answers your question - but maybe it will be of use.
I am guessing, if the camera wiring isn't in a separate wiring loom to the main body loom(s), then the main body loom may not be different between variants (comes down a decision on: cost of varying the main body loom/s vs. cost of material saved vs. cost of rework if wrong loom used) - in which case, if your lucky, it will be present end-to-end i.e. from the camera badge to behind the head-unit.
What I do know is head-units (with rear-view camera display) from other models (which use the same head-unit connectors as current i30s) have pin-outs with rear camera input in those connectors - so I would assume the same will apply for the i30s and their head-units - as to which pins, sorry no idea. I know Hyundai AU fits/fitted the GD-02 (head-unit with rear-view display) in i30 models which don't have SatNav, but do have the camera. I would guess wiring is there in all models - it is just what it is connected to... having said that I know in NZ i30 models with camera, but without SatNav, display the image in the mirror instead - so no idea if it signal is routed to both places and connected to as appropriate, or if there is a wiring variation depending on region.
As for the navigation unit - I am assuming it will have some kind of aerial for GPS (being the head-units are usually in a metal chassis) - I would assume this would be part of rooftop radio aerial. But I can't see the rooftop aerial being different between Elite and non-SatNav models... maybe they use a GPS capable aerial (and wiring - in which case it might be 'plug and play') across the range.
