Hi,
Laminar Research usually never introduces new aircraft once a new version of X-plane is launched. They definitely plan on improving them though.
That being said, don't expect the quality/complexity you might find on other payware such as Flight Factor, Carenado, JarDesign. Some of these products cost the same price as X-plane anyway.
Moreover, the choice is already extremely vast on X-plane.org, whether you are considering to pay ot not.
Hope this answers your question.