I just made an account to give my own update on my Model Y purchase.
Long Range, Silver, Black interior, 19" Wheels, 7 Seater, Tow Hitch
I ordered about 2 weeks back and noticed my VIN was F788xxx, before the range of VIN #s we've read about including HW4.0
Delivery windows was set for June 2 - June 8.
I called today to put on hold. They released my VIN and said June 1st, the day before my delivery window, I'd be issued a new VIN. At that point I could call back and put it on hold for the full 14 days.
I will report back when the new VIN is issued and let everyone know what it was updated to.