A Completely Different Way to Buy
When and if you go to buy the iPhone 6s or iPhone 6s Plus, you can count on a completely different process. They will still be available through the Apple Store, carrier locations and tons of retailers but the way you'll buy the iPhone 6s will be different.
Earlier this year, Apple stopped selling the AT&T iPhone 6 on contract through the Apple Store. It was a sign of things to come.
AT&T's introduced some new fees ($45 activation fee on two year contract, $15 upgrade fee for AT&T Next). And while you can still buy the iPhone on-contract through AT&T stores, you can't buy it on-contract through Apple or retailers like Best Buy.
Verizon's also planning some big changes to how it will sell you a phone. The nation's largest carrier is set to kill off the two-year contract on August 13th. Just in time for the iPhone 6s launch.
At this point, it looks like Sprint is the only one holding on to two-year contracts. Keep that in mind as you make your plans ahead of the iPhone 6s launch.