If the cost hasn't changed from the $2000 up then October is fine by me, just a little more saving time, that said, the delay of this lens and some other Canon QC issues, I will be sitting back and waiting for a few months...
On numerous occasions I have had to stop myself buying the Mk1 to use in the interim, but I keep reminding myself that "apparently the wait will be worth it"....fingers crossed.
I have that zoom range covered with the EFs 17-55 2.8, on my 7D, but, the 5D3 is my goto camera once the sun sets...
I guess like many things Canon (recently) time will reveal all.