Nothing concrete planned right now. We discussed it when working on the new element roadmap. Where we landed for now is building an element that is somewhat of a carousel/slider combo (like you’re suggesting), and the “Slide” works similar to a Column where you can drag/drop child elements. This is now possible because of the new Layout Pane supported nested content. It would support the advanced backgrounds (upper/lower layers) on each slide as well.
We don’t have true 1:1 parity for every classic element. You’ll notice there’s no Author element, but that can easily be recreated with a Headline and Dynamic Content. There’s also no Promo or Prompt elements because those had opinionated styling and can now be recreated with a combination of Headlines, Buttons, etc.
I’m pretty sure we have functional parity with the exception of the Slider element which is more because the path described above is fairly ambitious. We want to try it out, but we’re not sure if it will work just yet.
The Classic Slider itself was a nice idea back when we were using shortcodes but it didn’t translate the best when we mapped it in as a Cornerstone element years back. For now, I think the best base would be using a Slider plugin and there are multiple slider plugins bundled with the theme to choose from.