Per Tesla's stated algorithm, after Tesla employees, after current Tesla owners, after US West Coast to East Coast after whatever other stipulations Tesla stated.
But no one is asking for those results now, just for where the Tesla customer's orders are in numeric order upon which everything else is based.
I see quite a few good reasons and not providing it is causing quite an uproar already from cancellations to massive threads on Tesla forums and tech sites where people try and parse the reservations number to find their numeric sequence.
And then there's the pure ethics of it. Being honest and transparent with customers who showed confidence in Tesla to deliver the T3 years from now and put up $1,000 each to show they meant it. Any ethical business would reward such customer loyalty.