They have been in stock and on display here in Northern Virginia at Spokes. Can’t say about elsewhere, but it seems that specialized shipped a bunch of bikes in December and January.
Since it’s been almost a year since the SL debuted - May - I suspect that the next batches will be for an updated model, even if those updates are slight. Updates that may be driven by the supply chain as much as new technology.
I am actually picking mine up at Spokes this Saturday. It's weird that when I tried to do research on the Vado 5.0 SL, most reviews were from the UK. Surprised that the bike debuted almost a year ago and not many mainstream review sites have reviewed it yet. Perhaps that was also due to Covid.
I hope they don't come out with a new model every year. How do people handle upgrading every two or three years? Do these bikes hold their value if you try to upgrade in a year or two?