Releasing word prediction was in the pipeline for a quite some time. It might finally arrive in the next release, we'll see.
There is a neglected branch at https://code.launchpad.net/~onboard/onboard/word-completion
Word completion and prediction should work ("Full Keyboard" only) and the line of text you mentioned it there too. It's very unpolished and outdated though and it's way too early to file bugs on it too.
Releasing word prediction was in the pipeline for a quite some time. It might finally arrive in the next release, we'll see.
There is a neglected branch at /code.launchpad .net/~onboard/ onboard/ word-completion
https:/
Word completion and prediction should work ("Full Keyboard" only) and the line of text you mentioned it there too. It's very unpolished and outdated though and it's way too early to file bugs on it too.