I decided to try setting up OpenBSD (stable) for use with my next webserver, and I've found that using packages (which is recommended for new users) to install Hiawatha gives Hiawatha 9.15.
I can see that in ports, juanfra has been referencing Hiawatha 10. 1
Is it likely that the latest version of Hiawatha will become available through the pre-compiled packages at some point? (Or am I doing something wrong?)