@GrumpyMom do you have your S10 Plus yet? Keen to hear your thoughts...
Short answer: I'm afraid not.
TL/DR:
I've not heard a thing about my order, which has a hold placed on it pending receipt and evaluation of my husband's trade in of his S9+. That was sent in on Monday of this past week.
They process only one preorder/order at a time in a queue, when those orders involve a trade in discount.
So if you pre-order/order two phones and the first one that was ordered has a trade in of an older phone, the wait for the second phone can be considerable.
Not to mention my particular model, AT&T 128 GB Flamingo Pink shows currently on their site as being available to ship on April 5th if ordered today. I had gotten a backorder notice from day one of my pre-order.
My husband and I went through this when we pre-ordered Note 9's with trade ins. I cancelled my pre-order and he still waited over a month for his backordered model to be shipped. It turns out Apple released, offered for pre-order and managed to ship out iPhone XS Maxes to us while my husband's Note 9 pre-order languished in limbo well over a month.
I think he had his XS Max for a few days when he decided to cancel his Note 9 pre-order. It was absolutely insane!
And inexcusable.
Mind you, for my S10+, I had a reservation for pre-order that supposedly guaranteed me a shipping date on the release date. But you have to read the fine print to see that it's an offer that is conditional on factors like there not being multiple trade ins to the same household involved and that the delivery date promise is valid only while supplies last. And my model slipped in availability almost immediately.
Fortunately I'm a stickler for reading the fine print and terms, so I knew what I was letting myself in for. I actually used this system to my advantage to queue up multiple orders for different models so I wouldn't lose the $550 trade in offer. It took me awhile to really make up my mind I want the S10+ after all.