You can see what scratches will look like on Jet Black version. Verge has a picture of one of the demo phones at the event that already has scratches on the back.
http://www.theverge.com/circuitbreaker/2016/9/7/12836762/iphone-7-announced-black-scratch
yea im ninety percent there on the matte black i prefer to use my phone without a case seems like the logical choice plus its more understated and the jet black does look a little plasticy from certain angles like others have stated .... 90 percent hehehe