A few days ago, some unofficial but yet plausible synopses of the upcoming episodes were uploaded in Kametsu:
>Steven Universe S05E02 - The Trial
US Airdate: May 29th, 2017 at 7:15PM
Synopsis: Steven goes to court with the diamonds and is put on trial.
>Steven Universe S05E03 - Off Colors
US Airdate: May 29th, 2017 at 7:30PM
Synopsis: Steven discovers some unusual, unexpected allies.
>Steven Universe S05E04 - Lars' Head
US Airdate: May 29th, 2017 at 7:45PM
Synopsis: Steven finally gets to know the real Lars.

What are you honestly expecting from the 1 hour special, /co/? Is there something in particular you would like to see addressed? It would be nice to get a look at all those gems using mechanical extensions due to the resource crisis or whatever is happening there. I'm stoked for seeing BD finally getting mad, it would add a layer to her character of being terrifying whenever she wants to be.