Well for the fourth season they can talk about the fight to make "Family", the departure of Wheaton, the creation of the Cardassians, and the big Klingon finale. At least for starters.
I'm also hoping they delve into the making of the 4-footer in some detail (either in the S3 or S4 set).
I forgot this was the season Wheaton left. Actually with what you bring up, there is a lot of stuff that happened in Season 4. Here I was thinking it was business as usual.