Krita 4.0 has been released, indeed we need a Spine plugin. Krita becoming quite popular it seems, it's a good program that focuses on the artist rather than pixel pounders.
This thread has gotten a lot of views in just two months, there are many others wishing this.
Tell you what, do the plugin and I'll upgrade my artists to professional license, as we no longer will need to go through Photoshop.