the cell memory that is used in the iPhone was changed from MLC NAND to TLC NAND and it was causing boot looping and crashes, so they've been changed the 64GB and 128GB from TLC back to MLC. So it's taking them awhile to go back into these phones and replace the memory chips.
Same here order mine on 10/22 and still didn't receive any email of the status. My device was suppose to ship on 11/14. Status still say expected ship dat 11/14 too.