Not quite sure what type of answer you're looking for. A class action lawsuit is for when a company has wronged a large amount of people. While the Note 7 issue is a mess, I wouldn't say Samsung has "wronged" me. They are replacing each and every one of the defective phones, and anyone who has experienced property or personal damage at this point, seems to be having that taken care of by Samsung as well.
So there is no dispute (at least for me) at this time. I have a Moto Z Force loaner phone, when the new Note 7 comes in, I will attempt to exchange it, if I have problems doing that, then at that point other options may need to be pursued.
But at this point, there aren't any grounds for a class action lawsuit. Every person who has purchased a Note 7 in this country has the opportunity to return it, get a refund, and get another Note 7 when they are available, as well as a small compensation for the inconvenience.
So unless you're looking to try and get a class action started, or think that one should be started (why?), I don't really see the point of the question.