Are you referring to some method of displaying "XYZ units available" next to the cart button on a Merchant's page? As far as I am aware, we have no plans to do so, as that would be rather difficult to implement with the way our cart works.
Other, complete CMS/Storefront solutions that auto-build an entire site with templated pages for you could do that sort of thing much more easily, since that kind of software is far more than just a cart and actually manages your entire site content. If such software is generating entire pages on-the-fly based on your product database , it can dynamically output whatever product-related data you want, right onto the product page.
Our system does not manage your site content nor build complete product pages for you; you manage your own content and page design however you wish, and our button codes just add the cart functions into your existing pages.
Since our cart only generates a display of the cart overlay screen itself, I think the closest we might pragmatically accomplish would be reporting stock left in the cart screen -- e.g., after someone Adds to Cart an item, next to that item in the cart we could possibly find a way to show a "quantity left" figure for that item.