Aren't tracks usually available for download before as CD releases? I'd guess it'll be on iTunes on Sept 29th too (only a guess, mind).
I don't remember that happening with "You Know My Name", but that's probably not the greatest example to follow. To be frank, I have absolutely idea whether they'll put it on iTunes on 9/29 or 10/28. I'm just going by what I've read on the boards. October 28 for the CD and September 29 for the vinyl.
I certainly hope the digital release will be the 29th. It makes sense to me that they would release a legitimate digital copy to battle pirated LP singles.