IMac 5k ram upgrade.

Dear all,
Hopefully this isn't a huge repeat topic.
I am looking to get the new iMac 5K. I have held off for around a year now as I thought they'd bring a high res iMac.
For me though, 8GB of RAM isnt enough. I am not willing to give apple £160 for an extra 8GB. So I would upgrade myself but here is my question/s.
Can I simply install 1 x 8GB card, is it that simple? Does the stock 8GB of RAM come as 2 x 4GB? Does this mean I need to buy 2 x 4GB RAM Cards?
Also, is the access to the Ram cards still in the back or is it now more complicated? I don't want to risk damaging anything, especially the display by opening the iMac.
Any help would be appreciated.

According to the published specs here:
https://www.apple.com/imac-with-retina/specs/
Apple wrote:
8GB (two 4GB) of 1600MHz DDR3 memory; four SO-DIMM slots, user accessible
Configurable to 16GB or 32GB.
That means yes, the stock 8GB comes 2 x 4GB modules, and you can add a 8GB ram module to one of the remaining slots.   Make sure it matches the speed of the currently installed modules for best performance.
You can buy a single 8GB module or 2x4GB modules. Its up to you.
The access panel is on the back. 
https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2639+RAM+Replacement/20249

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