fyi, Expressive Seasonal has been renamed to Expressive Winter. (because not all seasonal themes are in there, just the Winter and December holidays ones)
When Expressive Seasonal was added last year, it was created as a new layout so the new themes would be easy to find instead of trying to pick them out from the Expressive drop-down.
There are some Autumn, Summer, and Spring themes from Vox. I'm pretty sure those were added before the Expressive Seasonal ones, but I could be remembering wrong.
That makes some sense. It's been suggested that a "New" theme filter be added to the theme chooser sidebar. It certainly would make it easier to find them, since there are so many themes now.
Comments
There are some Autumn, Summer, and Spring themes from Vox. I'm pretty sure those were added before the Expressive Seasonal ones, but I could be remembering wrong.
(also, in my other comment, I meant to say that your hatch icon always makes me want to laugh)