The Midsummer Festival steeds will not be going away from the vendor, and we are in the process of simply shifting over to a system where mounts are available either for Festival Tokens or Mithril without a staggered release. It will make less maintenance work, and is more in-line with the feedback we've heard over the years. While older festivals won't get these changes right away, we do intend to shift over to this model over time for all of our festivals.