Damn I would hate to go through ATT Next. I assumed it would be available at the same time since I could see it on Apple store now.
Will it support the LTE bands used by ATT as well?
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For the North America version..
There was some discussion about this in a different thread, I can say the "contract-free 5s" works with AT&T LTE just fine, taking a look at the specs, it "appears" the same should also hold true with the iPhone 6.
https://www.apple.com/iphone-5s/specs/
Model A1533 (GSM)*: UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz); LTE (Bands 1, 2, 3, 4, 5, 8, 13, 17, 19, 20, 25)
http://www.apple.com/iphone-6/specs/
Model A1549 (GSM)*
Model A1522 (GSM)*
UMTS/HSPA+/DC-HSDPA (850, 900, 1700/2100, 1900, 2100 MHz)
GSM/EDGE (850, 900, 1800, 1900 MHz)
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 28, 29)
The iPhone 5s vs. iPhone 6:
IP5S: LTE (Bands 1, 2, 3, 4, 5,
x, 8, 13, 17,
xx, 19, 20, 25,
xx, xx, xx)
IP6X: LTE (Bands 1, 2, 3, 4, 5,
7, 8, 13, 17,
18, 19, 20, 25,
26, 28, 29)
The iPhone 6 has supports the same bands as the iPhone 5s plus additional bands: (7,18,26,28,29). So.. there should not be any LTE interoperability issues..