I believe a while ago I saw someone post that the IV iD's would be available till the end of the year but many of the options currently available MAY NOT be on the iD site till the shoe comes off. I believe someone asked a Nike Rep about this and they said that all options would not be available till the end, which makes sense.
If Nike buys a set # of different parts in different colors to create their shoes for iD, it only makes sense that near the end of the production run, there would not be a full plethora of pre-made colored options, therefore our choices for customization will diminish.
If someone can confirm I would greatly appreciate this but I'm 99% sure I remember the screenshot someone posted of them asking a Nike Rep. Hope this helps!