Can we expect trading ships to be part of VO 1.9?

You mean like the Atlas, Centaur, Marauder, Prometheus and Behemoth?

The above ships all have 32cu of cargo space or more.

Or did you mean: "Can we expect the ability to trade ships with other players in VO 1.9?"

Best to expect nothing, then be surprised when we get something. It will allow you to remain a happy person :)