Yep! Looks like the silent hardware upgrade happened in v5.0.0 of the OS.

Here's a youtube video published March 13th talking about it: https://youtu.be/ZzsbDGDwg1U?t=5m17s

And here's a related reddit discussion on the nintendo switch subreddit: https://www.reddit.com/r/NintendoSwitch/comments/8588c1/50_w....