There’s nothing too spoiler-y below but if you want to know nothing, skip this post! There’s more general information at the source, I’ve only copied the Kenzi/Ksenia related.

Will we see more of Kenzi’s back story?
Jay confirmed that we will learn more of Kenzi’s back story and that she is much more complex that we initially believe she is. Also they have had a lot of fun with all of this. Look for a Wizard of Oz reference in Season 3 involving Kenzi.

On their favorite episodes.
Solo said that Episode 6 in Season 3 is her favorite. It involves Dyson and growling, but she would not say more. (Source)