I think the label has probably narrowed it down to RR, DL, and Heartbeat, if they haven't decided already.
I would say Heartbeat is it for sure, BUT it's hard to see Carrie debuting that at the AMAs, and I think she will debut a new song there, don't see her doing SB anymore..
The fact that Heartbeat got a stripped version exclusive to Target and none of the other tracks did is a pretty good indicator it will be a single at some point. Also, it features a pretty popular country artist right now - Sam Hunt. The song also mentions a "harvest moon" and although that generally makes me think of September-October, I suppose it could also be a winter song, what with Valentine's Day coming up (although Carrie has publicly said she hates Valentine's Day)
But then I think about a video for Heartbeat and I feel weird. Would Carrie be in it, or would they use actors?
RR is on the total opposite end of the spectrum. It would be perfect to debut at the AMAs, people would probably like it, a video is pretty easy to imagine for it...it's the opening track of the album...it got teased in the Smoke Break video...pretty good chance it will be next, too. It's a toss up!