Usually, you would expect 10 to follow after 9. But in the world of Java™, things move a little faster. Or at least it will be if the proposed release model in Mark Reinhold's blog post Moving Java Forward Faster is adopted.
The next version of Java™ will then be versioned as 18.3 and be delivered as soon as March 2018. Then we will get version 18.9 in September, and so on.
In my opinion, this is pretty cool. Having a time-based release cycle for Java™ allows for developers to get smaller features delivered faster without the need to wait for the bigger, more time consuming, features to be completed.
I am convinced this proposal will be discussed and commented a lot in the community, so be sure to follow the #javatrain hashtag on Twitter.