Unless they trade someone, the starting line up isn't going to change from what they were when the playoffs first started.
contrary to popular belief Cle isn't a hot bed for NBA free agents with or without Lebron. With James older players in search of a ring will be interested but no young proven / rising star will come freely. It was the same problem Lebron faced in his first go round in Cle and it'll be the same again. Irving is locked in therefore, the most likely trade asset is Love or Smith.
I doubt anything happens and as you suggest it'll be the same (or close) to the same starting line up. Mosgov signing isn't done until it's done. my guess, Cle Mgt thinks with a healthy Irving and Love this would have been a different series. As a result, no big changes just some additions to the bench. Thompson will be overpaid to keep his services and James happy but everyone else on the bench is fair game. Delly too.....