Forget the accessories, I am 100% sure it will be selling for $550 for the 32gb one in a month after going live, like the previous generations.
I can sell my 5 month old iPhone 5 and get the s4 for no extra, super excited for the launch.
Another part of the reason why I'm hanging onto my iPhone 5 as well. Even if I miss my 30-day return window at Apple, the resale value of the devce makes it a logical "temporary smartphone" until I commit to either the S4 or the One.