In regards to the 12 pin connection, the answer is yes your vehicle will require one to accommodate the 12 pin plug on the van.
They may possibly change it over to a seven pin at the dealership at your request. Although the problem with this is that the fridge wiring is run from the heavier pairing of pins 9 (fridge live wire) and 10 (fridge earth wire), using 6mm "auto" wire.
We've just arrived home with the new Swift. The 12 pin is not an issue, its the opposite actually, as the heavier wiring is a vast improvement on the old system that ran through the 7 pin. The added bonus of the 12 pin is the fact that there are a couple of spare ports available for various usages (I'll be having a gander at that option some time soon). So there ya go, the 12 pin gets a thumps up.
On the new Swift front, its all good so far, although we did get a flat tyre at Girraween National Park the other day.
We haven't done anything in the modification department, nor taken a lot of photos either. Managed to line the cupboards and sorted out the internal storage. Fitted the battery (it's not wired to the tug yet). Gave the jack and spare tyre a workout, and thoroughly enjoyed spending a week to get back home.
I'm off on business for the next week, so she's washed and sitting happily in the garage until I return ... and then the fun begins.