I haven't heard of any for July (though I could be wrong.)
The parks are full in summer; the kids are all off and the families flock to WDW. I'm not sure I would hold my breath hoping for a PIN code. (Cross my fingers and toes, yes. But not hold my breath.)
I just found out that you can make payments on your reservations as long as you've paid it off w/in like 45 days of your date of arrival. So if you call in to make the payment and ask if there is a pin attached to your name, and there is, can you take advantage of it then?