As mentioned, there is no clear date.
Today, though, I was looking online, and there is a speculation for October 10th as a release for the note 4, but as far as the edge, nothing, just that it will be after the Note 4.
I believe AT&T and Verizon will start pre-sale tomorrow. T-Mobile will start on Sept 24, and Sprint will start pre-sale on Sept 26th. The Note 4 will be released on Oct 17th.
Preorders should start on the 26th and sale date oct 17th, At least that is what I just found out online.
you should be able to get the 64Gb, but as I stated on the other post, you might want to try the 312Gb, Samsung has not released any info about it as of today.
Sorry I thought you were talking about the edge, and with my understanding, the 64Gb edge should come out on the same time with the 32Gb one.