I'm happy to hear that the dimensions are the same, since I have some existing accessories that would probably not work if the size were a bit different.
I probably will too (currently on an iPhone 5) given that my current strategy is to replace my phone every 2 years by buying a refurbished model with 12 month warranty for ~£150 from eBay. I usually get ~£50 or so for each old phone so the physical phone only costs me £4 a month.
4GB data (4G), unlimited texts and unlimited minutes for ~£20 a month here in the UK. Was always amazed at the price of plans in the US, luckily I never had to pay my own bill when I lived there.
Contrary to the popular meme, not all people buy Apple because they're shallow appearance-obsessed hipsters.
Ha. No. The significant reason people buy new iPhones is because their cellular contract is up for renewal and they will get one for for free/cheap.