The ebay sales are for their standing in line on the 19th, though they don't say that.
What they do is sell any Apple phone 6/6+, any size, any color. Then they promise to ship out as soon as they have it.
They designate that the buyer gets to choose the size and color.
So it's a bit illegal if you ask me, they are selling property they don't have already. They are "scalping." Usually the target buyer is over seas.
This puts the seller at risk. Look at the seller's reputation. Their track record is too small to be of any trustworthy value.