It seems that the iOs app got a UI update in the recent version... I've got mixed feelings about that.
Overall, it's not bad - not that many aggressively orange elements anymore (e.g. in the splits chart), rather streamlined view of activity details... I like that!
However, tiny details bug me, such as the changed highlights in the notifications: Previously, new notifications would be highlighted with a background colour, old notifications would have the same background as the rest of the app; now the old notifications are highlighted, that's quite confusing.
Is it a bug or a feature? Or perhaps just a partial / unfinished change in preparation for the dark mode (fingers crossed)?