Inexplicably absent from the update notes is a really big fix that has been asked for for years: A model card now lists every ecosystem it has a version for (except Anima because it doesn't have an abbreviation. Such an odd omission since it seems to easy to fix EDIT: That's been fixed.), and searching filtered by base model finally finds models where the filtered ecosystem isn't the newest model.
While this is the primary reason I always published new ecosystems as their own model, I don't think I'll switch over to using different versions for different base models: I've got over a hundred separate Pony and Illustrious models that are separate, most with significantly altered tagging+training data that merits a description change, and the trainer's publish wizard has no way to post directly to an existing model (I keep a local copy of everything I make so it's already getting DLed, but it's enough pointless extra work to upload the file I just DLed I'm not doing it unless I have to). Still this is great for anyone who isn't super invested in a current organization method.