WB's panel is not just about Kong, the full list includes: Wonder Woman, Suicide Squad, The Lego Batman Movie, King Arthur: Legend of the Sword, Kong: Skull Island and Fantastic Beasts and Where to Find Them.
The panel is 2 hours long, from 11:30am to 1:30pm, that means 20 minutes each (though I think Suicide Squad might take more). Enough time to make a few jokes but not too many, but since the show will be streamed, WB might prefer to keep the attention on the movie.
Anonon yes Jason will be there. I pray TS will be too.