Will this phone or a variation be available on another carrier?

Possibly. You could also buy an unlocked version to use with other carriers, though you won't get LTE.
 
Experience with previous cursed AT&T scum exclusives shows that it won't. The only chance may be to get an RM-938 if they ever really become available (those on ebay, Expansys or whereever now claiming to be RM-938 seem not to be it).
 
I was coming here to ask the same thing, I'm really looking forward to a Tmobile variant. Verizon is to expensive and only matches Tmobiles coverage in my city and AT&T has been awful around me. Sprint OK in my city but the selection sucks.
 

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