Just check my google account and about to set-up another channel ads for one of my site, and found this option during set-up labeled “corner styles”

And there is an additional code in your adsense code that you will notice saying “Google_ui_features = “. Not much interesting news so far in terms of adsense but somehow beautifying how adsense ads are displayed and a possible increase on adsense ads clicks or CTR.

Maybe we should observe if indeed, made some significant contribution on high CTR, worth a try!