Well, we can’t really know. I have some speculation based on Saint Thomas Aquinas’ thoughts. By itself, I would think it’s experience would be rather limited, if we could say anything about it at all. However, it would certainly be within God’s power to augment its experience, say, by giving a saved soul the beatific vision. It would be filled with experiencing God’s goodness. We also know that those in Heaven can, with God’s help, hear the prayers directed at them, and can pray in what manner they can for the living, though this might not be the bodily type of praying we would normally think of. I imagine that without God one way or the other and left to its own devices, the soul would feel quite empty. A soul on its own with no body and no intervention from God (except the basics of God’s creative act allowing things to exist according to their nature) makes me think of the traditional concept of Sheol, the pit, the darkness… though that might just be fancy on my part.
We do believe in the resurrection of the dead, so the soul will eventually be united with the body and its sensitive powers again.