The IKG/KE series was kinda jumped forward in A Singular Destiny. Several of the characters play a minor role in the story , and it also gives us some updates on what has happened to other characters who don't actually appear in the story. We don't know if any there will be know if there will be anymore entries in the series, but it does show and tell us what the characters are up to 5 years after the last KE book.
Oh, good point. I think Klag's status as of 2381 was established in Destiny before that, come to think of it. And of course both DES and ASD revealed some things about the status of the Corps of Engineers characters at that point. So that series was "kinda jumped forward" as well, at least to the same limited extent.
I guess, basically, the only 24th-century Lit characters whose status wasn't established in Destiny were the DS9 characters other than those aboard the Aventine. And I guess some of the NF characters, although there was an allusion to Calhoun's ship.