My experience Monday at a corporate store and later best buy...
Entered corporate store and asked greeter/sign-up guy what my options were for my note7. He said full return or pick out any phone for now and they'd swap me back for a note7 when they're available again. (Totally his suggestion - never had to ask)
Asked him a couple more questions and he put me on the check-in list so I could talk to an agent (I'm assuming that door checker is the beginner position in the store).
Looked around at all the phones in the store for 5 minutes or so, pulling out my note7 to compare with a couple different options. Let me just say there was nothing as slim, smooth, or better screen in the whole place - even the 2 S7 models seemed klunky and poorly put together by comparison.
Then had 2 agents approach as I was holding my note7 next to an S7e. The guy explained the options I had while the female agent nodded and offered assurances that the whole double swap thing would be easy (it was almost like they were prepared for customers to pitch a fit - no surprise given the entitlement attitude in this town). I mentioned that, from what I'm reading, the failure rate seems pretty low, and I'm thinking I'd rather just keep using mine and wait to swap when replacements are available. The guy proceeds to look around the room, then pull his note7 out of his pocket and say that was his plan! The girl agreed, and showed hers, too!
Guy says something to the effect of 'of course, we have to say you should turn it in now...'
Thanked them for their time and said I'd be back hopefully next week.
Later, at best buy looking at a surface pro 4 for my wife's birthday, i was listening to the rep explain the value of the pen they include with the tablet. Pulled out my note7 and said I'm already sold on the pen idea - rep had one in his pocket as well and said he was going to wait for a replacement N7 too. He said he felt he was more likely to get in a car wreck on the way home than to have his N7 burn up.
That's my experience, your mileage may vary, you should turn in your phone now, the sky is falling, the check is in the mail, if you don't enjoy it we'll just stop, blah blah blah...