U.S. Galaxy Note 5
U.S. carriers aren't talking about the Galaxy Note 5 just yet but there's a very good chance that it will land for carriers in the United States.
An early, and credible, Galaxy Note 5 release rumor pegged AT&T and Verizon as potential Galaxy Note 5 carriers. This makes sense given their close relationship with Samsung. AT&T's carried every single version of the Galaxy Note. It exclusively carried the original Galaxy Note.
The rumor confirmed model numbers for these two carriers and we've seen the Galaxy Note 5's model number show up a couple of other times since then all but confirming the SM-N920 tag for Samsung's unreleased phone.
If you're in the United States and you want to buy thise phone, you'll likely be able to do it on all five major carriers and you'll likely be able to do it soon after its announcement date.