I backordered the Pi 5 8G on Digikey a couple hours after it was announced, because nowhere else had preorders up yet - maybe they were caught by surprise or something. Also I had good luck getting Pi 4 from them relatively quickly when they were sold out everywhere.
But I've heard absolutely nothing of the Pi 5 order since, because it definitely hasn't shipped out yet. Their lead time tool is estimating 2/14/2024 for new orders.