Domino 10 is out from a end user perspective but from a developer perspective not much is added.
We have got some new classes for Lotusscript, upgraded version of eclipse in designer but that gives so far more problem than positive effects.
IBM/HCL has said that they will come out with a developer roadmap and that will be interesting and I hope that it will contain the following and I will explain why.
a future roadmap for the basic client with development improvements, why because a new client for IOS is released that there has been talk of Android and Webassembly that is why this must improve why spend money on this if no one should use it for new development.
Updates to XPages with new functionality, updated Dojo and Extension library. Why, this is the ONLY mature development option on the platform except legacy Domino web development. And Domino developers will probably not jump on and start moving all code to a new dev platform again that is in Beta.
Updates to the http web engine like http/2 and websockets. Why, because modern web development requires fast delivery of resources and the app.
And finally maturing the new NodeJS engine with more functionality to support Domino security and api more like LS and Java