Xen Project 4.10.3 and 4.9.4 are available
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See https://blog.xenproject.org/2019/02/26/xen-project-4-10-3-and-4-9-4-are-available/
Those are maintenance release with some backports.
However, 4.12 release date is relatively soon, expect a blog post with some interesting details when it will be here!